Check out old Dave London & Filthy Rich stuff first and foremost. They did heaps of classic trance breaks business like remixes of Art Of Trance - Madagascar, Ascension - Someone & The Thrillseekers - By Your Side. I used to collect all this sort of stuff eh, trance & breaks were the two things that got me into dance music so any crossover drove me crazy!
Oh, and get your hands on all of Hybrids older stuff (Wide Angle, Morning Sci-Fi). Trancey/Progressive breaks that pretty much ruled the roost of the day. Check the Hybrid remix of Future Sound of London - Papua New Guinea is epic as fuck, trippy prog breaks and Energy 52 - Cafe Del Mar (Hybrid Remix)
The label that much of that kind of stuff came out on was Distinctive.
If you need more I can dig through my crates. I know I've got some old PVD breaks stuff and some old Infusion remixes of trance tunes