ebuyer have been fine for me - bought a fair amount of stuff, no problems, never late and often delivered early. A mate had to return a faulty CD-RW drive a couple of weeks ago, and although it wasn't very quick as it's done online, it was hassle-free, and he got reimbursed for the postage too.
Not used Dabs... but aren't they run by a woman? Anyone know if she's a looker?