hmm mx300, mx500, mx510, mx518, Microsoft IE 3.0 or 1.1, Razer Deathadder, Razer Diamondback, A4tech X7. I use the Razer Deathadder, it’s nice. Get done what I want done. The Microsoft IE 3.0 is pretty rad too, my friend buddha uses the one I gave a couple months ago, he does pretty well it, winning a tournament and all 
Those are rather cheap too, about 30 bucks, you can get one of those bundled with a really fly *edited* mousepad too for a bit more. Funny thing about the Microsoft IE 3.0 is that is has something like a 125 polling rate and rather low dpi, yet it *edited*ing rocks, it is next to impossible to find tracking problems with it. If you like the big feeling of the g5 you will really like the IE 3.0. I definitely prefer the latter over the g5. The Deathadder feels much the same just a bit smaller.