The G9/G9x isn't really a small handed mouse. I know a lot of women like the notebook mice a lot better than the bigger sized ones.
I've been really happy with this little Lenovo travel USB mouse that came with my work laptop. It's small but has a solid feel. Tracking is great and the mouse wheel is illuminated.
http://www.provantage.com/lenovo-41n5671~7LEN902E.htm
yeah, I agree the wheel button is a bit hard to press, thankfully I never get to use it often. which grip are you using, precision (the narrower and textured one) I suppose?
personally I have not had a pleasure of using another mouse with a better fit than the g9![]()