I almost never buy gear "retail", but when I do it's usually either Echo Audio or Gig Harbor Audio. Echo in particular has been really good to me, more than once they've helped me avoid a system mismatch or a sideways move from the gear I already have. In other words, they've talked me out of buying something.
How many dealers do you use?
When buying gear retail, do you use only one dealer with whom you develop a relationship, or more than one?