Great post guys, I was looking into the same thing for my 4wd. Cain I was looking into a 7700 also, and was planning on running IB3800's. If they can pull a 9 single for 6-7 minutes I would think it could handle the 7700. But I could be wrong. My thing is my local track is setup for 1/8 scale, we have a 160' straight, big flowing track. That is why I was leaning towards the 7700.
Mike