I've see a few things that have been touched on... doneddat has a great comment. However there are a few more that need addressed.

Let's start with ISP. A lot of them are capping bandwidth and that many people are going to chew though a lot of it. Your best option, and this is besides the point on caps, is that you guys are going to have the same kind of internet needs as a small business. Look into getting business class internet and find out the type of gear your going to get. Now you can settle for putting everything on the same network or having each apartment with their own network. You'll need to talk to your roommates to figure out how you want to do this. PLANNING IS EVERYTHING!

If you want everyone to have their own network then buy static IPs and WIRE the WifiRouters to the Internet/WAN/ISP/etc Router and problem solved. You could perhaps add a 3rd guest network for file sharing, gaming, etc. It's up to whatever your needs are.

If you want one large network then this would be a little easier in terms of file sharing, gaming, etc. However it could get a little hairy if you don't spend the money to do it right. You'll have dead zones, odd drop offs, etc. To to this right you'll need to get one WifiRouter that is wired into the Internet/WAN/ISP/etc Router and place range extenders (Better if you can wire them into the WiFiRouter). This will give you coverage. I saw a post from randomneckbeard that shows a pretty promising setup using unfi. I've never used it so I can't say if it's going to work. I can say that in my experience, short of putting in enterprise class wireless using Cisco APs and a WLAN controller the One Big Ass (OBA) WiFi network almost always has problems.

On a side note: I can tell you about Comcast business internet. That's what I use in a number of locations I deal with and it works. You'll have to pay an install fee that is based on the length of the contract. You can't escape that. For a one year contract it's $199. (BS I know...) For a pack of 2 IPs it's about $15/mo extra. You can't bring your own modem so it's $7 rental fee (More BS I know...) However what you'll get, depending on your area, is anything ranging from 12/2 to a 100/25 connection. Going from about $70/mo to $200/mo. That split 8 ways is pretty damn cheap for that kind of a connection. Even it it were 4 ways you'll still be paying less that most people for that fast of a connection. Plus it's uncapped so you can stream, game, download, etc. all you want.

So to sum up my advice:

• Get business internet
• Setup Wireless routers per living space aka Apartments with Static IPs purchased from ISP.
• Enjoy your awesome new pad

If you have any questions on this feel free to ask me. I'll be happy to help if I can.