Hi, do you have a budget for your build and 750W is an overkill for just a single graphics card unless you plan to add a 2nd GTX780 in the future.
Even getting a second would result in lower performance based on the motherboard, so yea the power supply is a little over kill.
Personally I feel like you are overspending on the RAM since the motherboard base can only accept 1600MHz without overclocking.
I would spend $10 more and get the Samsung SSD here I have just heard better things from Samsung users than Transcend.
Also just so you are aware with the 144Hz monitor you are going to want to try and get as close as possible to 32, 48, 72, or 144 fps, anything other than that and it will look very similar (if not the same) as a regular 60Hz monitor. I believe that Nvidia has settings where you can lock in or cap frame rates.
You dont need hundreds, just the right number is all.