EDIT: completely forgot about the $200 "WalMart" PC...
Fwiw... I bought one of those $200 wally PCs a Long time ago - back around 2001/2002. It was a via CPU and chipset. I whacked the linspire or whatever it was and installed gentoo. I tossed the slow VIA cpu and put a cheap & fast celeron in... Decent system until I noticed and eventually tracked down the on-board ATA controller DMA corruption problem. Other folks reported the same problem.
While I don't have hugely negative feelings about the system, when I consider the amount of time I spent tracking down that f'n DMA problem, that $200 machine was a bust. I'd wager that they knew about the problem and that's why they were $200 systems. No doubt the new systems are completely different and don't have the problem... I'd rather start with a good case with 120mm fans that can take 5-10 drives.