For dry goods, I prefer kens fish and your fish stuff. For new world cichlids, Jeff rapps at tangled up in cichlids is top notch. So is Dan at cichlids of the Americas. For old world stuff, I pretty much only buy from Dave's rare fish.
The wetspot also has a nice list with fish across the board.
Different Dan. Dan at COA is in Florida. You are thinking of Dan Ye Jennings. She used to live in Denver. Last I heard she was getting out of the fish business.
Don't really know what you are looking for but for dry goods I have had great luck with Dr. Foster and Smith. Good prices and great customer service. For Africans I have had good luck with Little Africa Aquatics and SI cichlids. Congrats on the big tank.