I think I'm just gonna go for that $50. I don't really like prebuilt PCs.
Edit: So for $335 budget for this PC Half new Half used (I actually have more but don't wanna spend that much so, yeah) I got the specs
Used parts
MOBO : Gigabyte P61-ds3-b3 for $25
CPU : I5-2500 for $50
4*2 GB (1600mhz)...