should i buy this: http://www.ebay.com/itm/New-NVIDIA-GeForce-GTX750TI-1GB-DDR5-192Bit-PCI-Express-Video-Graphics-Card-US-/262844559418?hash=item3d32c1b03a:g:VrgAAOSwx6pYnC1S
And this: http://www.ebay.com/itm/Dell-Optiplex-755-Mini-Tower-2-4GHz-Core-2-Quad-Q6600-4gb-DDR2-DVD-RW-/311803192323?hash=item4898eb2403:g:jbEAAOSw2gxYpGV4
And this: http://www.ebay.com/itm/Dell-Optiplex-755-Mini-Tower-2-4GHz-Core-2-Quad-Q6600-4gb-DDR2-DVD-RW-/311803192323?hash=item4898eb2403:g:jbEAAOSw2gxYpGV4