I found this one for only 236.99http://www.amazon.com/PNY-GeForce-DisplayPort-PCI-Express-VCGGTX7602XPB/dp/B00DKX0NBU/ref=sr_1_6?ie=UTF8&qid=1396541455&sr=8-6&keywords=GTX760
But to answer your question, the 4GB card is the better option in my opinion. Both of them will perform almost equal. But some games lately like BF4, take up a LOT of graphics RAM. I have 3GB with my GTX780 so 3 should be enough for a couple years but I think 2GB is the bare minimum for right now. I think by 2015 we'll be seeing games where 3GB is needed.