Help me pick out some hardware for the new wireless home network.

[gridiron123]

Currently two desktop computers and a single laptop...would like to plan on having the ability for another laptop and desktop computer without a whole lot of hassle. Distance needs to be 90ft or better through a bunch of walls. The main connection is on one end of the house and the one desktop/laptop is on the far other end (home is 20x80). The laptop already has a wireless card so thats not any problem. The two desktops will need cards. Looking to purchase from new egg. This is my first wireless hardware purchase...so someone please shed a little light on what I need to look for