Sorry guys, I thought I had replied to this thread already! The Formula 34 is an extra-torquey motor with a little less top end than the R-Spec but quite a lot more bottom end. It's great for tracks where you're accelerating out of corners a lot but still need a good top end for the occasional long straightaway. Give it a try!
http://tinyrc.com/shop/product.php?pid=414
