I'll second VaporBeast with regard to service, though it seems that unless you're getting one of their crazy deals of the moment (Promoted through Vapor Joe's, who they market through) their pricing is at best nothing special and in some cases significantly higher than competitors.
I'd probably vote for Sun Vapers in CA as my pick of the online retailers, consistently good product and pricing, they ship super fast, and I try to support vendors that spend time on education and advocacy, which Edward the owner does in spades.
My 2 cents for what it's actually worth.