Reddit mentions of Vacuum Cleaner Attachment Flexible Extension Hose Kit with Tool Accessories Compatible with Brand Names and ONLY some Models Including Riccar, Simplicity, Eureka and some models of Shark Navigator

In your situation, as much as you prefer uprights, I would buy a canister. Why? Because you are a apartment dweller, & you have both hard floors & carpets to clean. Uprights can do both, but not as good as a canister with a horsehair hard floor brush. A canister would also be better for a apartment dweller because you can get under low spaces like beds & coffee tables easier, get into tight spaces, & if you move into a apartment later that has all hardwood floors & area rugs & small scatter rugs, you can still use your canister - but an upright? Nope. Most won't do small scatter rugs as well, & don't pick up as well on hard floors as a canister does. Also, if you plan on using the hose a lot with the attachments for furniture or above floor cleaning, the hoses on canister vacuums are MUCH BETTER & nicer to work with than the stretch hoses on upright vacuums.

In your price range, you could look into getting a used or refurbished Aerus Electrolux or TriStar CXL canister from a local vac shop or Ebay. They are both quality brands, bags & supplies are reasonably priced, & they have decent cleaning performance & reliability. You could also look into a used Miele canister with the SEB228 or SEB236 as well, especially if dust emissions is a concern. You can get generic HEPA filters & generic bags for them at reasonable prices, & although some people here & vac shops don't recommend using generic bags in them, I have not had a issue with the generic bags as long as you use them with care. If you insist it must be new, though, there are a couple other options. The Riccar Prima canister can be found for slightly out of your price range, & is a high quality bagged powerhead canister with HEPA filter & metal brushroll. You could also look at the Bissell Powergroom canister, that is in your price range & is bagless if you prefer that. https://www.amazon.com/Bissell-Powergroom-Multicyclonic-Bagless-Canister/dp/B01AAYGAFY/ref=sr_1_25?keywords=canister+vacuum&qid=1562192705&s=gateway&sr=8-25

If you look at uprights, make sure it has some way of shutting the brushroll off, whether it be by pushing a pedal that shifts the belt & the brushroll stops turning or a switch that shuts off a brushroll motor in the powerhead. The bagged Hoover Windtunnel suggested below would be a good pick. Anything from the T Series line would be a good choice. If you prefer, they also make bagless models. The Miele Dynamic U1 uprights I would not recommend. Miele's canisters are good, but their uprights are heavy & bulky, poorly designed & they have had several issues with them in the past, particularly with the quality of the onboard stretch hose. Bad enough that The Wirecutter dropped the Miele uprights from their list of recommended models. From Sebo's lineup, I would only recommend the Sebo Felix upright for your situation. Their uprights are reliable & well made, but also big & bulky. The Felix, however, has a brush on/off switch, swivel steering, the ability to convert to a handheld canister (albeit a bulky one), & the powerhead can be swapped for a hard floor brush to turn it into a full-sized upright stick vacuum. For a apartment dweller, that would be ideal in your situation, since you presently have 1/2 hard floor / 1/2 carpet, plus if you move to a place with all hard floors & area rugs & small scatter rugs, this is one upright you can still get use out of in that environment. The Fuller Brush recommendation is also good too, & like the others they have a HEPA Cloth bag & HEPA filter, but they are made in China. In your price range, for slightly more money, I would go to a vac shop & look at the Riccar Vibrance/Simplicity Symmetry uprights. Those are American made instead & slightly higher quality. For the price they want for that Fuller Brush upright, you could get a Panasonic upright from Amazon, with similar features, for 1/2 the price, with comparable quality. I would also take a look at the Cirrus uprights, they are another high quality upright comparable to Riccar/Simplicity & with similar features.

If you go for the Hoover Windtunnel or Fuller Brush, Riccar/Simplicity, Cirrus or Panasonic uprights, there is a hose kit available for them that gives you a super long hose, wands, crevice/dusting/upholstery tools & floor brush that you might also like to use as well for hard floors, as well as for above floor cleaning if you don't like a upright's stretch hose. As for cleaning pet hair, if you are talking about cleaning it off furniture, whatever you do don't get one of those turbo brushes! Yes, they do remove & clean the pet hair off the furniture, but the hair wraps around the brushroll & you spend just as much time cutting the pet hair off as you do vacuuming. What I have found really works well is if you buy a upholstery tool with red felt velour strips. These 2 upholstery tools from Shark & Miele are just examples, there are plenty you can find & choose from. Bissell & Hoover have also made pet hair tools in the past that have rubber blades & bristles that work well too. Also note that if you find a attachment that isn't 1 1/4"/32mm, & you want to use it with a vacuum that does use 32mm attachments, you can find all sorts of adapters to make tools fit different vacuums.

https://www.amazon.com/Maresh-Products-Attachment-Accessories-Simplicity/dp/B07HQJ6TRM/ref=sxbs_sxwds-stvp?keywords=vacuum+hose+kit&pd_rd_i=B07HQJ6TRM&pd_rd_r=cda8a449-8a14-462a-816e-765f01b65d9f&pd_rd_w=Q4NcM&pd_rd_wg=1uwY8&pf_rd_p=a6d018ad-f20b-46c9-8920-433972c7d9b7&pf_rd_r=XMCG7GHMWDC0VW4W5SDJ&qid=1562209066&s=gateway

https://www.amazon.com/Enbizio-Replacement-Parts-Rocket-Upholstery/dp/B07D5KJ1FT/ref=sr_1_90?crid=1MDHV4VVFBNNT&keywords=pet%2Bhair%2Bupholstery%2Bbrush&qid=1562210431&s=gateway&sprefix=pet%2Bhair%2Buphol%2Caps%2C167&sr=8-90&th=1

https://www.amazon.com/Miele-SPD-Wide-Upholstery-Tool/dp/B002QKMU4G/ref=sr_1_2?crid=16MJEV3M1DEW5&keywords=miele+upholstery+attachment&qid=1562210977&s=gateway&sprefix=miele+upholstery+%2Caps%2C171&sr=8-2