YHM are pretty economical compared to many "higher end" rails.
The YHM Diamond/Lightweight seem to be the most popular with OUR customers, but I dunno about overall.
YHM Handguards at JoeBob's. There are literally thousands of handguards out there, so I'm sure you can find something with the features/price range you want to spend. The Diamond rails are the ones I personally like the best out of the YHM lineup.