err.. yeah, i sold a few months back a perfectly good rb30 manual box for $170...
ba... autos are boring after a while.. trust me, I've had both Just change the diff for same results. You'll find most of the extra acceleration in an auto is the better ratios.
Not if you can find a very good condition car, that just happens to be auto. Autos are a few $k cheaper on average, so why should the gearing type be a concern? Manuals have better control on both the twisties, and the track as well.