As an angelfish fanatic, I have a couple of suggestions (and I hope posting about another specialty forum isn't a problem).
(1) visit the Angelfish Forum II. There are only a hundred or so top breeders of great-quality angelfish. For the most part they all know of each other, and will tell you who currently has the best of a certain type. There is a Fishkeeper's Bazaar there that you can ask for opinions of who has the best of any specialty type. Many times you'll wind up being pointed to Aquabid anyway, but you'll know who specializes in what. Unless you have lots of $$$ to spend, many of the fish will be young - so you'll have to know who is really good and who has been overdoing the inbreeding of a specialty line.
(2) if you're REALLY into angelfish you'll want to join The Angelfish Society, which sort of maintains the standards and naming of types of angelfish.
I hope that you have a serious-sized tank if you're going to buy 10-12 of them - a full-grown angel can be the size of a baseball. Also, super-veils don't do well in community tanks - many active fish like Danios just love to nip their finnage and tails. I know - my latest full-grown breeding pair (probably worth $150) was purchased for $20 a fish after a LFS put them in a tank for one night with Danios. The finnage was torn to shreds and nobody would buy the fish. 6 weeks of care later I had a stunning breeding pair. I keep 6 large angels and 4 medium Discus in a planted 135g tank, and must change 10% of the water daily to keep them in top health.