I know there are plenty of very good +$100 gaming mice, but I just recently purchased the Corsair Vengence M95. This mouse costs $80 on Newegg and i felt that for the 15-button and the layout it was a good price, and cheaper than the R.A.T.
My first gaming mouse was a 9 button Logitek M series (i dont remember the model it was a long time ago) great mouse and a great entry towards gaming mice.
Just wanted to start a thread where people could speak out and let people know of good gaming mice.