Seasonic is a reputable brand, their feedback speaks for itself.
All you need to do is plug in all the cables where they were with the old power supply. They are fairly easy to install, just take your time and make sure everything that was plugged in is plugged in again.
The Corsair HX series are good, the 650W version would work fine, but you are also paying a $45 premium over the PSU i suggested.
However, you do get extremely good build quality, better efficiency, and semi modular cables, meaning you only need to have as many cables installed as are required.
That makes cable tidying and air flow a lot better.
The Seasonic has 48A, i added that in an edit, but you may not have seen it.
I just read it, my bad! And would that 48A be enough and still give my power supply some breathing room? Oh and are there different types of Power supplies? Cause I dont wanna run into any type of compatability issue
(Some other person told me to buy a Single 12v rail thing)
Actually, i just found more info. You will be at the absolute limit on the 12V rail with a GTX 770, i would say that you should probably go with the GTX 760, just to be on the safe side.
Sorry that i just doubled back on my previous post, i found a full review of the PSU
Oh alright, well would you suggest any other PSU incase I ever want to upgrade?
And is my current HP brand PSU modular? (I dont think so) and if it is or isnt, whats the difference between modular and just normal?