Reddit mentions of NETGEAR 16-Port Gigabit Ethernet Smart Managed Plus Switch (GS116E) - Desktop, and ProSAFE Limited Lifetime Protection

If your devices are truly pushing that much data and you really need 2GB to your computer, you'll need both a switch and a network card that support LACP (Link aggregation).

Most relatively inexpensive prosumer switches support this now, look at something like this for a switch and this for a NIC.

There are, of course, tons of other choices for switches and NICs - just make sure they support what you need.

2 HP1810-G8 units?

Yeah, the webUI is shite, but I've seen the others in the space (HP's 1910 and 2810) and they're simultaneously worse AND incapable of managing vLAN tagging (not without hitting the CLI).

Go try the netgear one and tell me whether it's worth it: https://www.amazon.com/dp/B00GG1AC7I

Not all-inclusive, still need some physical cables and such, but hopefully this is a starting point:

16-port gig switch: https://smile.amazon.com/dp/B00GG1AC7I/ Probably overkill but a few more ports doesn't cost all THAT much more and this leaves you plenty of room for expansion. Also managed so can setup VLANs, QoS, whatever.

Router: https://smile.amazon.com/dp/B00HXT8EKE/ These are solid for home and small business use. Config can be a little tricky if you are using any of the advanced features but plenty of throughput (1 million pps). Also supports VLANs if you want to spin up a guest wifi later.

Wireless AP: https://smile.amazon.com/dp/B015PRO512/ This supports multiple SSIDs on different VLANs and offers really solid performance for not a ton of money. From the physical space you listed below I'm thinking one should me more than enough.

Cable modem: https://smile.amazon.com/dp/B016PE1X5K/ I know you said this wasn't finalized but thought I would toss it in anyway. Don't skimp here, a low-end modem will really limit throughput and can crash under heavy-load. Whatever you go with make sure it's on your ISPs compatibility list! They may not support it if not.

That should put a total around $512 USD or so JUST FOR HARDWARE. Keep in mind this is a pretty basic setup but should serve as a starting point. You'll still need the physical cabling and someone able to set it all up. As mentioned earlier also this is only MY BEST GUESS as to what you will need. Please don't take this as your bible or anything like that. :)

I know I mentioned it before but I really don't mind helping set things up if needed. I'm not going to be your "call at 3AM tech guy" but if you need a bit here and there I can try to assist. :) Let me know if you have any questions or thoughts on the build. Cheers!

EDIT: Something else to keep in mind that's not really network related is backups. YOU NEED THIS. Even if you go with a cloud service like carbonite or whatever, you need to make sure the PCs have regular backups. You WILL have a hard drive die and need to pull a backup from somewhere.

not the best deals, but each has at least a few bucks off

basic: https://www.amazon.com/NETGEAR-8-Port-Gigabit-Ethernet-Managed/dp/B07PLFCQVK

fancy: https://www.amazon.com/NETGEAR-Nighthawk-Streaming-Advanced-Ethernet/dp/B01MU3GE5L

if you need the 16 ports: https://www.amazon.com/NETGEAR-8-Port-Gigabit-Ethernet-Managed/dp/B00GG1AC7I

Can usually get this under $150.
NETGEAR GS116Ev2 16-Port Gigabit Smart Managed Plus Switch | ProSAFE Lifetime Protection https://www.amazon.com/dp/B00GG1AC7I/ref=cm_sw_r_cp_apa_F-8MzbZ83CB1E

I'm a sucker for Prosafe Switches as they carry a lifetime warranty, and the only time I had to use the warranty the switch wasn't made anymore and they sent a new one. But I just noticed the new slimmer one with a cool mount, I really now want to get one to play with for my house. I only have 6 right now, but once my basement is finished there will be 8 more so the 16 looks quite delicious. If you don't want the fancy mount the 16 port managed one is like $78, I currently have the 8 port after I upgraded from the 5 port, they both worked/work great.

Ok, so this is where things get blurred for me. If a switch has Link Aggregation, does that mean it has LACP or just that is supports manual LAGG configuration? I see a product like this and don't know if it will do what I want.