Reddit mentions of Apollo Horticulture GLRLS24 6" Inch Air Cooled Hydroponic Grow Light Glass Reflector Hood

That's a lot of money for a fan. You could always get a cheaper fan that moves more cfm and simply get a fan silencer. You would still save money at that rate and spend the rest on an enclosed hood or cool tube to help with temperature control.

Overall you're good.

Fan Silencer (out of stock at the moment, but cheaper): http://www.amazon.com/VenTech-VT-FS-6-Muffler-Silencer/dp/B00HWILBSS/ref=sr_1_3?ie=UTF8&qid=1450225496&sr=8-3&keywords=fan+silencer

Fan silencer (more expensive, but in stock): http://www.amazon.com/Phresh-701200-Silencer-4-Inch-12-Inch/dp/B007ZU5YQS/ref=sr_1_6?ie=UTF8&qid=1450225496&sr=8-6&keywords=fan+silencer

Hood Upgrade: http://www.amazon.com/Apollo-Horticulture-GLRLS24-Hydroponic-Reflector/dp/B00BMVK8HG/ref=sr_1_1?ie=UTF8&qid=1450225652&sr=8-1&keywords=air+cooled+hood

Fan and Carbon Scrubber Replacements: http://www.amazon.com/VenTech-VT-IF6-CF6-B-Controller/dp/B0051HDECS/ref=sr_1_1?ie=UTF8&qid=1450225799&sr=8-1&keywords=ventech+vt+if6

If you're going to be flowering in the tent, I would recommend lightproofing it, as well. Use only the ports in your tent for intake and cut some carbon filters to size. http://www.amazon.com/Carbon-Pre-Filter-38002-Activated-Sheets/dp/B00LXIWNT4/ref=sr_1_1?ie=UTF8&qid=1450225982&sr=8-1&keywords=carbon+filter+sheet

Your tent is a little expensive, too. If that's the one you have your heart set on, go for it. As an alternative, I suggest http://www.amazon.com/MILLIARD-Reflective-Hydroponic-Mylar-Window/dp/B00ETBDX14/ref=sr_1_1?ie=UTF8&qid=1450226158&sr=8-1&keywords=milliard+grow+tent

You will want a fan or two of some kind to circulate air inside the tent. 6 Inch clip fans are popular. I use a pair of 4 inch clip fans and a tower fan.

Make sure to look into a DIY Ona Bucket for smells. During flower it will stink up your room when you open the tent. Just turn the Ona bucket on a little before that and you're good. If you're really paranoid about smell, you can also get an inline carbon scrubber. They're pretty expensive and probably not necessary unless you pick some especially fragrant strains. http://www.amazon.com/Phresh-500-Inline-Filter-6-Inch/dp/B00CJIMUH2/ref=sr_1_1?ie=UTF8&qid=1450226390&sr=8-1&keywords=phresh+inline

That's my $.02, anyway. There are much more experienced growers here.

LED lights are fine if you have the budget for them, but if you want to use the entire 5x5 tent, you'd want at minimum, 2 900-watt LEDs (preferrably with 5-watt LEDs for better penetration). Nothing wrong with Mars Hydro. You could always just buy 1 to start, and use only half the tent.

A Single 1000-watt HPS light with a vented hood and 8" fan is what I use in a 5x5 tent with good results.
Ballast: http://smile.amazon.com/gp/product/B00WAKP4YK?psc=1&redirect=true&ref_=oh_aui_search_detailpage
Hood: http://smile.amazon.com/gp/product/B00BMVK8HG?psc=1&redirect=true&ref_=oh_aui_search_detailpage
Fan: http://smile.amazon.com/gp/product/B00GYG39UW?psc=1&redirect=true&ref_=oh_aui_search_detailpage

You would also need, bulbs (MH for veg., HPS for flowering), hangers, ducting for the vented hood, and optionally a carbon filter if you want to control smell. Also, professional growers typically replace their bulbs every 6 months because they lose that much brightness over time...so you might want to factor that in.

One final note is that LEDs do have the advantage that you can grow taller plants...as they are lower profile, and you don't need the same amount of space between the tops of the flowers and the light.

Oh, and what the LED lights draw from the wall is different from what they are listed as...typically they draw about half the amount they are listed at. So an LED that is listed as 900 watts, is actually using closer to 450-475 watts of electricity. The general rule of thumb for lighting is that you want a 35-50 watts of light power per square foot of canopy (for LEDs, you would use the amount of power actually used for this calculation).