Well i have some experience with the following :
DBL Distributing which has mostly consumer electronics. The have pretty good prices (i.e: about as cheap as you could buy stuff new on ebay for). Quick turn around (same day ship) and they even send you daily spreadsheets with inventory, ...
I'v also used D&H, they have both consumer electronics and computer gear. Prices aren't the best. They are sligltly bellow retail on most items and some decent deals on other items. However they have a great website and awsome turnaround (orderd a few computer parts in the morning) the next day UPS was knowking on my door.
I'v also tried Ingram Micro. Their prices sucks IMHO, better off buying from regular online stores and reselling it

And Ingram, is kinda picky about dropshipping.
Last one i would have to try is TechData which carries lots of computer stuff. They have dropshipping but they call it "Private Label Shipping". Dunno their prices, havn't signed up with them yet as they require a 100$ application fee.
Hope it helps.