Yeah I am in the same boat. I have a Cisco lab upstairs in a room which has no connectivity so I want the wireless access to config it from anywhere in the house, desktop, laptop, hammock in the garden
I can't tell you what a good one is to get but I can tell you do NOT get a minitar card hehe. I bought one and am having no end of troubles with it. granted it is being run up on a really old computer but it is anything but easy. The PCMCIA card which I also bought runs wonderfully on WinXp though.
Good luck and happy hunting!