SO I am planning on buying an iMac 27inch. I was checking the prices - The 2K display with 1Tb fusion drive is only 200 less than the base 5K model. I just wanted to ask whether the difference between the two GPUs is huge - GT 755m vs AMD 290 ( Not the X one ). I don't want for extreme usage. But I would be doing moderate gaming. Games like GTA V and Fifa. Some future proofing would be welcome.