RoboCop had a really good, diverse score. The RoboCop March in particular--pounding and heroic during battle, but somber and tragic in scenes of loss. The musical variety is actually so bipolar I didn't realize it was the same notes the first few times.
Same with For A Few Dollars More. Everybody remembers The Good, The Bad, and The Ugly, but I think it's FAFDM's music that is truly the superior. The almost lax "whistling" of Eastwood's theme to the definitive "twang" of Colonel Mortimer are perfect character identifiers; the lush, full score of the bank heist to the quiet, personal chimes; all of these marry perfectly into the film as a whole and enhance it, whereas GBU can seem repetetive or forced.
The Thing really stands out as well (no surprise, as it's also done by Morricone). It does not make any grandiose cues or "this is some scary sh1t" pieces--it builds the tension and paranoia meticulously, deliberately. It's been a while since I heard it, but unless I miss my guess, there aren't even the seemingly obligatory "shrieks."
Ghostbusters is great, too--one of the few comedies I've seen that has good music it didn't have to borrow. The blend of Leonard Bernstein and eighties music is a daring, quirky mix that suits the film's funny/scary qualities.