Gotta say, I've run RT615s, RE71Rs (not the RE71RS'), and the V730s.
I like the V730s the best, but they're a bit narrower than the old 71s, so I think I lose a little time, but they seem to tolerate heat a little better.
Since I tend to over drive a course (thus generate heat), they seem to keep my times more consistent.
I'll probably get them in 225s next (on 205s now).