Is it worth giving 350$ more for the titan or not, and is it worth upgrading from my 680 to 780? I need gaming benchmarks, bf3, metro, you know , the stuff that make GPU's cry. Some benchmarks appreciated, also is it in stock on amazon since the card is rumored to be released today?
It depends on if you are not satisfied with the performance of your GTX 680. Keep in mind that the GTX 770 is due to be released next week, and the GTX 760 Ti shortly after that, which may lead to a shuffle in the current pricing.
If you do get the GTX 780, be sure to look for the ones with custom cooling, mainly because it's key to maximizing performance to keep the GPU below 80c. The stock cooler is probably one of the best made, but it just doesn't consistently keep temp below 80c. http://www.techpowerup.com/reviews/Gigabyte/GeForce_GTX...
In my opinion no card that cost over $450 is worth it for any reason. But then since I have not found any game that has not performed well on my SLI Gigabyte GTX 670's or my two Crossfire HD 7950 and HD 7970 rigs I just can't think of a reason I would need a card that costly. But that is just me. All of my rigs run at a resolution of 5760x1080 on 3 Asus 27" monitors.
But then most people would not have spent as much as I have on setting up 3 27" monitors on each of there rigs.
GTX Titan > GTX 780 > HD 7970 Ghz > GTX 680 > HD 7970
As far as rough hardware juice yes, but when you Ty all these cards in different games you will see that this comparison of yours changes a lot. And if you add SLI/crossfire it changes even more. So your 'in short' only works for hardware and present no real advise for actual gaming unless of course you wanted to say that Titan owns it all.