I don't really have 10, but mine are:
4. Komplete 6 (anything in it is amazing)
1-Z3TA
2-Nexus
3-Vanguard
4-Edirol Orchestra
5-Genesis
6-Toxic Biohazard is actually good(despite it being CPU intensive -_-)
7-Magnus Choir.
That's about all I use to make trance
I'll post 5 because if I choose any more I'd just be bulking out this list for no reason.
(in order)
1. Massive
2. Ozone
3. Kontakt
4. Nectar
5. Alloy
Who use Z3ta + ??? i think that it is useful