Which 3S Lipo should I get??

I have had a Novak 5.5 in it for about 2 months and just added the Mamba 2 days ago. So far the only damage I have done to the drivetrain is a stripped idler gear. The entire drivtrain is still stock. I relpace things as they break.

On the battery Austin at MaxAmps said that I need to run a lipo that will handle 100 amps constant and I can't find anything in a 3s that will do that and fit in my stock tray. I have decided against the velcro idea after some unsuccessful experimentation. I don't want to crash at high speed and have a $100+ pack get thrown out on the ground.