I've ordered both from Austin Homebrew and Homebrew Heaven. I BY FAR use Austin Homebrew and have been very happy with the service I get there. Being as how I live in Texas, I often have my materials in hand (or on the porch where the delivery guy dumps 'em) within 3-5 days.
I do like Homebrew Heaven for some stull kind of local to the Pac NW area...like bottle caps with sea turtles on them. Being female, I love that girly ****.
Do wish Austin Homebrew would get some more specialty bottle caps goin'. Little Texas flags or somesuch...