Welder's cable is great for relocating the battery. It's specifically made to run high current, is available in your desired sizes, costs about the same as battery cable, and is waaay more flexible- for those hard to route, tight spaces. IIRC, the summit kit (~$50) comes with it for the + cable.

-Chuck Dienzo Black 98.5 E1 SVT #5022 of 6535 Born on March 16, 1998 "If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason."