While I was doing research for my Halion Sonic review, someone mentioned to me that Nexus also makes a good ROMpler. Judging from the demos and the ever expanding sound sets, that very well could be true. The only down side is that Nexus won’t read anything except for it’s own file type, however there’s more than enough sample packs that will help you find your needs without breaking your budget.
The Hollywood expansion pack fills a huge hole in the orchestral instruments department that seems to be missing from most ROMplers, Halion Sonic included. Also check out the TV tunes expansion pack, which is free!