Dunno which camera to use, but how would 65M of USB cable work for you?
http://www.smart-e.co.uk/smarteusb.htm
I haven't used one myself, so buyer beware, but it looks like it will do the job.
I played with one of those x-10 wireless cameras (the ones that are now in pop-under ads EVERYWHERE) as a webcam for a while, hooked to the composite video in on my 7500. It was almost acceptable, but the video quality was quite low. Nonetheless, it was amusing..... point is, this also allows the camera to be situitated away from the computer, but at crummy analog quality.