I would recommend the best bargain you can find. Check the Anandtech Hot Deals forum and stuff like that. Get an "integrated" wirless card as opposed to one that sticks out of the side, if you can.. The card sticking out is kind of annoying.

Be very concious of size. Are you going to be carrying it around a lot? Use it in a plane? At a cafe? On your lap while you're outside? If so, you may want to fork up a little more to get a more compact design.

No probs with wireless here at my apartment. I've also played at a starbucks using wireless and no major probs. A couple times at starbucks I would get "disconnected" for a few seconds, but it would come right back with plenty of time left to act.