TPM has a wonderful score, near the greatness of the originals, even if just not-quite-there. I admit that it is my favorite prequel (read as: the one I don't hate in my guts) but this is in large part due to the great music, not the other way around.

To be honest, AOTC did have a great love theme and a few decent tracks; can't remember anything good and truly memorable from ROTS... too bad he didn't develop on TPM for them, rather just constantly rehashing the same themes (Lucas insisted?).

I am rather surprised no one has mentioned Michael Giacchiono's work on the Medal of Honor series? I am not so much familiar with his other works, as I haven't watched many of the movies he's scored (LOST and Super 8 being examples) but MoH has fantastic soundtracks that are quite similar in tone to William's great scores for the Indiana Jones series.

Try "Allied Assault", "Panzer Attack", "Medal of Honor" themes. All are fantastic and well worth hearing.