I go by the manufacture brand.

Just ordered pups, tuners and a bridge from Guitar Fetish. Also have ordered a lot of stuff from Stew Mac and Luthier's Merc.

On ebay I've used choppers music. Got a couple others bookmarked that I haven't used, but may in the future.

Another site that interests me is guitarheads.net.

^^^
This.
I have used Guitarfetish before, and will again if I'm on a super budgeted build. I think a lot of their hardware, especially bridges, is pretty good for the money. I've had no complaints, but I've also had realistic expectations about what I was getting.
However, as my skills as a builder progress, I'm increasingly loath to put anything on a build that doesn't have a decent brand name attached. Not that I'm knocking anything else, but there's a certain expectation of quality that comes with certain brands, and the more I build the more likely it is that other people, especially potential buyers, will be handling my work. It makes good sense to me to at least have decent branded parts on the instrument when this happens. MHO.

I've used a MM Pro bass pup and am waiting on some Non GFS clearance pups. Couldn't pass them up for the price. The GFS MM pup sounds great.

I agree on using name brand parts if and when I get to building for others. At this point I'm still learning to build and on a budget.