Hi, I have an HP DC5750 desktop (don't judge) and I was wondering what the best video card under $100 I can get is. I have a pci 2.0 slot which currently uses an EVGA nVidia GeForce GT 630 w/2gigs vRAM. Any suggestions? Also, I have 3gigs DDR2 RAM, would adding more make any noticeable difference? Thanks in advance!