now that you mention it, i may have to dig up my old copy of James Horners Soundtracks from Wrath of Kahn and Search for Spock. Those thigs were just great to drive to, or play games by, i dunno why i didn't think of that till now, doh
it should also be mentioned that he did the soundtrack for ALIENS which he originally wrote for star trek 4 but they dumped it out opting for funny christmas music (what with the wales and all) so he turned around and said 'who want's it?' and cameron jumped on it which is why you have this odd trek feeling at the end of ALIENS when they're flying off to those clangy bell things that are traditionally associated with klingons.
I'm pretty sure he did AVATAR as well, but not certain, but it sure sounds like his style.