I know there are lots of threads asking this same question, but I am looking for an updated answer.I have a Dell XPS 8500 with the original AMD Radeon HD 7570 video card. I have an LG Flatron IPS235 monitor. Everything on the PC is stock. i7-3770 processor with 8GB RAM. I just recently got into PC gaming and realized that my current card will not run any modern games like Fallout 4, Witcher 3, or Star Wars Battlefront. Based on the previous threads I will need a bigger PSU. My questions are how much bigger PSU will I need if I get either a GTX 970 or R9 390? Also, are those cards going to last me or should I look at something else while I am upgrading as far as future proofing goes or am I better off getting a sub $200 card now since I will have to upgrade in a few more years?