You know... I am probably going to get beat up for saying this... but even if cost was not a factor, I would still be running my OS V-Spec in the buggy. It is pretty easy to tune, and it holds its tune well. I run OS mills in all my Nitros (.21 V-Spec, RG-X, and .30VG) and I am very happy with them. I started with OS motors when I flew RC Planes and I loved them then. There are faster, and better made mills out there, but I am happy with them. In fact I am getting ready to put an .18 in my TMaxx.
Tom