Had the same dilemma. Wanted a best set of carbon clinchers and could of had Zipps, Reynolds, Eastons etc etc for £1000 - £1500. decided in the end that all these wheels had pretty generic hubs and, whilst fine, the money maybe could have been spent better elsewhere. Hand builts.
I ended up looking at several different carbon wheel builders and settled with one i had experienced previously, and was local to me. Ended up with a Zipp style rim, a copy if you like, but with Chris King hubs. The rims are logo free and have a very similar spec to the Zipps mentioned above. If you crack or break a rim they can be replaced and the hubs come with a 5 year warranty. They ride AMAZING. Price was £300-£400 less than Zipps and essentially my mind was made up with the hubs. For me the rims were never going to play a bigger part than the hubs and that is perhaps the downfall of Zipp wheels.
Enve wheels are usally specced with King or Dt Swiss hubs - the perfect pairing, but for the amateur racer/rider they are serious overkill.
Isn't it funny how you first start out cycling thinking £50 for a cycling top is expensive and all of a sudden £1000+ is reasonable for a set of wheel. lol. The horror........