the 770 is better than 680
and a 680 is better than 7970
unless by better you mean price to performance ratio, you can get the 7970 really cheaply nowadays
Of course I meant price to performance, that's what the word "value" means
Sorry about the pricing confusion, I thought I was talking about the 760 instead of the 770 for the last sentence there. I actually don't know if two 760's could beat a 780, it would be interesting to find out but the answer probably is no
hey guys, current setup below
(gpu has since been upgraded to a gtx 670)
what is worth keeping and what should i upgrade? budget around 1300~1400
You could build a brand new computer for that budget, especially if you reuse all of your periphirals. I don't really know what you should upgrade in that build besides the storage, buying a new cpu (but it won't get you much better performance + you'll need a new motherboard most likely), or getting a better GPU than a 670 if you so desire.
Why do you want to upgrade? If you tell us the things you want to do or want to do better, we can make a more informed suggestion pertaining to your specific needs