What is the make/model of PSU you ordered ? It matters. And I think GTX 770 and a good/rated PSU will handle the upcoming games fine.
And when gaming and in full load the card can get up to 90 C or above, you will still be fine for years. Good luck.
Well my new PSU came in an hour after I posted my question. Got that and my new card installed. My PSU is a Corsair TX750. I have done some testing with Batman Arkham Origins on super ultra settings and OMFG not a single crash!!! No random black outs/display failures. I'm so not used to this I keep thinking something bad will happen but about 2hours into the game..not a single issue =D the 550 would have quit on me within 10-15 mins of game play. As with any game I tired.
I really think my 550 card must have been crap when I got it. I never liked the fact that it was EVGA and factory overclocked either. Also the 770 is staying at about 56c during game play...which also has me shocked because my 550 was only that low when idle or browsing the net lol It is good to know that gaming full load at 90c is OK non the less because heat has always been an issue for me. Thanks =)