There aren't that many big mice these days. Rival 300 is 133 mm, the rest are around the 125, 127mm length. New Microsoft Classic Intellimouse is 132mm, ect... Don't think the new Microsoft is gamer-friendly though.
Else, you'll be looking at the Mionix Naos, Mionix Avior, EC1-A, Deathadder, ect....