Re: Upgrade or Rebuild
Well I would say your CPU is fine as there are not many good upgrades for that motherboard and the CPU is still good. You can overclock it if you like to get a little added performance. RAM is good unless you have a 64bit OS then you can add more if you like. But I have the same set up but with 32bit OS and it only detects 3.5GB of that anyways. I would upgrade the GPU as that is easy enough to do, get the latest if you like to high performance game. An HDD upgrade is simple enough I have 4TB of HDD space in that same mobo. I don't know much about the PSU but I would look at power requirements of the new GPU you plan to buy and maybe upgrade it accordingly.
I would definitely not buy a new one yet as that still has a couple years left in it with a couple upgrades.
[Case = Corsair 400R][CPU = Core i5 3.4Ghz to 4.6Ghz /w Noctua NH-U12P SE2 CPU Cooler][Mobo = Asus P8Z77-V LK][RAM = 16GB DDR3 Patriot Viper 3 1600Mhz RAM][Video Card = PNY GTX 670][SSD = 240GB Force GT][Samsung S27B350 27inch monitor][Running Windows 7 64Bit]