Those kids prolly made more selling computers this week than many webmasters do here.
They don't have to have high expectations or shoot for the game guys. There are tons of people around that just want email, the web at any speed and a Word Processor. So PCs with those specs work. A little more RAM - for sure - double it.
As for harddrives. The quality has gotten a lot better and prices are right. Someone said used HDs are risky. They are. Still, say they do a day or two burn in on a system and its still working. It gets someone a computer on the cheap and makes those boys some bucks.
Bet there are plenty of smaller harddrives around they could get cheap.
