Hello guys,I have 3 gtx 660ti which i am going to sell for 260$ each and i can get 3 amd 7950 for 330$ each but should i get 3 amd r9 280x instead for 419$.Is it worth the extra 90 bucks or should i just buy the amd 7950,Really need help here guys and this my rest of the rig=i5 2500k,8gb...