What is a modest upgrade from i5 760?

I am looking to upgrade my Mobo and CPU. I currently have

CPU: i5-760 LGA 1156

RAM: 4GB DDR3 1600

GPU: GTX 560ti 1GB GDDR5

OS: WIN 7 64bit

MOBO: Asus P7P55D-E LX

(1+2 TB HD)

I built this system a couple years ago to play MW3, BF3 SKyrim, Fallout and such. It has been a good machine but earlier this year it suffered a power surge which blew the ethernet port on the mobo so i have to use a wireless usb adapter to connect to net. The entire system has become very unstable and crashes often. I took it to a professional who claimed to have worked for microsoft debugging software or something; he couldn't fix what ails though it does run better now. In an attempt to breathe life back in to it Im am going to replace mobo, CPU and reformat HD and reinstall OS. The 1156 socket is almost obsolete now and I am wondering what would be a modest upgrade to the mobo and CPU I now have. I dont need anything extravagan; I've already ordered a pre-built system from cyberpower with i7-4770 & gtx 770. This one will probably end up being my 13 yr old son's gaming machine. I am going to keep GPU, and maybe add a some more RAM. Also if you only have the name of a good PC building forum where I can post this question that would be a welcome answer too.