I buy a lot of computer parts online, but I am not a loyal customer of any one vendor.
It seems to me that, with online computer parts stores, the main differentiator is price. I figure out what I want from reading reviews and then I order it from the vendor that offers me the lowest price.
I find the lowest priced vendors by seaching on price comparison networks such as:
You have to be careful to include shipping in your calculations, often the vendor that
appears to be lowest priced won't be after you include shipping. That is a common way that onlien vendors scam unaware consumers.
Best of luck with your buying online!