Ugh, wireless mice I've used have a low sampling rate, both optical and ball, both logitech. I've heard the explorer wireless isn't that great either. I'd go with a good Intellimouse Explorer 3.0 with a cloth pad (its relatively smooth, the feet are different and work well with cloth pads) because it tracks better (I'm using gray, and it NEVER skips, even moving extremely fast). I can run at 200hz, but windows 2000 doesnt work with 200hz in quake3 very well, (both logitech and MS mice, my keyboard goes crazy, dunno, weird). Its 6000dpi, compared to 1500dpi on the older versions of the MS explorer's and older intellimice. The razor boomslang 2000 I think is 2000dpi, as a comparison. On a lot of surfaces, though, it doesnt work too well. I have a white everglide pad, which it slightly skips on - but I'll be dyeing it a different colour soon, hopefully it will work then.
I'd say that the MS Explorer 3.0 is the best optical. Wireless, I dunno.