that's kind of a hard question, since it's most people don't research _that_ many prelims. i would figure out what programs you are interested in for ortho, then check out the gsurg/prelim situation at those schools.
that said, my home program (where i will be prelimming) is UT hsc-san antonio. our gsurg interns and categoricals are equal in teaching and opportunity. plus, we are given the chance to meet the reqs for application into a pgy2 ortho spot.
cheers.
firegirl