Vengeance packs are good, but there's quite a few overprocessed sounds in some of the "Club Series" packs which have little to no headroom leftover. Don't get me wrong–you can definitely find some nice hits and samples in the packs, however, I would check out some of the Loopmaster Artist Series packs. The Blokhe4d pack, for example, is absolutely priceless (as is the Loxy/Resound pack IMO).
And whatever you do, do not purchase any of the "Supalife" DnB themed packs from ProducerLoops[dot]com. I made that mistake once, never again.
Also, download the demos of the packs to take them for a test drive.
Cheers.