I know Tanks 2 U used to have a really good reputation but they unfortunately shut down. I know a lot of people complain about chain stores, but the Petco on Lehigh Street in Allentown has always done very well by me. Much like people here the fish people there actually seem to care about the fish and have talked me out of fish instead of just getting the sale. In addition they've been able to order me some rarer Barbs that have done well in my tank.
Something Fishy has a great reputation as well, but that's only SW as was already said. I really wish they'd consider expanding into fresh as they'd probably do a great job with it.
If anyone knows of anywhere else good in the valley I'd like to know.