Yeah I think the ofna jammin is the s***, price is the thing that gets to me. I've talked to the owners of acehardware hobbies and they'll start running those when they race. That speaks to the engineering that ofna did on that truck. They'll never run anything else. I run a gs conversion sut and I think it rips with a hyper 8 in it. As for the xtm mammoth st, holy s*** it comes with a 2speed tranny, that most tracks won't allow, but it has good bashing qualities, high speed, almost bullet-proof and is a great jumper.
HPI is supposed to be releasing the Hellfire mid January if your still looking for a truggy. I got the 3rd one my LHS gets in reserved and it's destined to be converted to brushless. Tower has it listed for pre-order at $589.