You don't even need a wireless card for your PC if the cable/DSL modem is already in your room where the PC resides. Most of the new wireless router have 4 LAN ports in the back. So just get a wireless card for your wife and make be a set of antenna (but test out the receptions first as those things is a bit expensive). Also, I suggest you go with Linksys, D-Link, or Netgear. Belkin isn't really that good and you can get a better quality router for a few bucks more.
PS: Don't forget to secure your wireless access points. Other people can easily hi-jack your connection and have access to the Internet for free.