It only took a GTX 760 and Bioshock Infite, but I don't think I can go back. I am seriously considering canceling my Xbox One to upgrade my case and a few other components. I was blown away at the size of the GPU when it arrived yesterday! BARELY fits in the case I have but, thank god it does because I've never seen a game look so amazing. I am going to go broke buying games I've already played just to see the difference. This is like playing in a whole other universe! Can't believe I've been missing out on so much for so long.
Edit: I still plan on getting both consoles in the future, I've just been a "Day One" buyer since the N64 days. Now that I have a competent PC, I'm just considering investing my money that is currently set aside for xbox one, into my new rig. Can't think of any launch day console exclusives that I can't live without. Figure I'll have both consoles within a year of launch either way. I love my gaming.