Greystone: For a heavier mouse, I haven't tried any of the Madcatz RAT mice, but I can definitely recommend the Logitech G700s. It is wireless, yet, the battery that is needed provides the extra heft. I thought I would be bothered by it, but not so much anymore.
To the OP: If you're looking for an "upgraded" feeling mouse, then you should definitely consider a G700s... if budget permits. It's a $100 mouse.
I have tried a bunch of mice; the G9x, Razer Taipan, Steel Series Sensei, G400, Razer Deathadder, and while I can't definitively say the G700s is the best out of these... I definitely like the G700s a lot. It is the one I've decided to keep after having used all those other mice.
Certainly, in terms of build quality it is the best. People have complained about the sort-of cheap feeling of the extra side buttons, but the mouse's body shell is absolutely rock solid. And is the sturdiest of all the mice I've tried.