I'm not really here, but I'm just tossing this in here. (Internet has been broke here at the house for a week, could be a week more till it's back up properlike.)
As Evil pointed out, the older G5 is probably one of the best choices. In all seriousness, you won't notice the cord at all. I have never, ever, not even once, 'flicked' the cord of the G5. It's a light / thin one that doesn't slide around like the regular mice cables.
But, the point that the G7 is very similar is important. Note that the early gen G7s did have really crappy battery life. I had one, and it would only go about 6 hours of gaming time before it would run out and I'd have to swap it out. I hear this was resolved and the batteries last a lot longer (in addition to not using the slick surface anymore). So, a current G7 should be fine if you absolutely can't do a corded one for some reason.
Also, and I'm on a poop connection, so I won't be doing my usual links, somewhere around here there is a link to the new G9. (I know my site has one.) It's really horrifically expensive, but it's got a changable faceplate and more buttons than the G5. It's also got a bit more resolution, but that won't really matter as 1600 and higher is fine for 1920x1200 res, so unless you are running that high, or higher, or really like a super responsive mouse, you probably don't need it.
I'd say try the G5.