Looking for variety, I got:
Black Velvet - Loud, Grunge, Rock
Studio Percussion - World, Dance, Funk
Reel Machines - Electronic , Dance, Pop, Rock
and the associated Midipaks - Loud, Percussion, Reel (recognising they can sound good with alternate kits).
I already had the Studio Pop, Prog, Rock from X3.
I figured I could get the Fairfax Bundle (1&2) at a bundle/sale price (if the GAS levels rise). But whilst demoing they probably weren't even next on my list ... which was probably Vintage Dry. Is there a bad choice? Sound all pretty solid for their respective jobs/genres to me.
Still to choose my kitpieces.