I have £450 to spend on a graphics upgrade for my pc. I am buying an AOC or Asus 144hz monitor for £199 and would like some advise on how best to spend the rest. I already have an MSI GTX 970 and my upgrade options are - buy another MSI GTX 970 for £199 and go SLI, buy an MSI GTX 980 (none ti) for £239 or but an AMD RX 480 for £249 (selling my existing GTX 970 on the last 2). I play mainly fps games and want the best performance.