You could get any hardwired camera then use a wireless xmitter to send back to the PC. That way you can get a decent quality camera. The native wireless cameras are for crap.
For recording, I bought a Kodicom card. I haven't actually installed it yet, but that's coming soon.
For an example of cameras and wireless transmitters, check out http://www.spycameras.com/main.htm . I've never personally purchased from there as I have a few "favorite" merchants that source me whatever I want, but that site seems pretty complete.