I didn't vote b/c the poll choices don't include "Whoever is cheaper."
When it comes to:
Newegg
ZipZoomFly
Ajump
Monarchcomputers
And a few others I can't remember offhand, you're safe, AFA quality, service, packing go. It's about who is the cheapest, TOTAL (including shipping) for whatever it is you're buying.
I just built a dual-Xeon rig; I ordered the components from three different etailers.