I've used the G303 quite a bit and I really do recommend it as a mouse, custom DPI, also a precise optical laser, you can turn on acceleration or leave it off, whatever you like. Also a little above price limit, but I do recommend it. It fits the hand nice, I also play fingertip grip. I'm letting my friend borrow my 303 right now haven't used it in like a month but I'm pretty sure it's about a medium size mouse, should fit your hands perfectly.
When it comes down to it, swing by your local best buy I know they have a display of mouses you can just feel for and get an idea what you like. I'm not sure but I think other stores like microcenter also have a display.