I like this :
HD 6850 Gigabyte
XMS3 2x2gb 1600Mhz
500GB WD Blue(Already have)
DVD-Writter (already have)
If you can change that 6850 with 6790, at your monitor resolution is more than enough and change the i3 2120 with i5 2300 is a quad core.It will be better for 3D max , Premiere Cs4
The 2500k not worth if you don't buy a P67 or Z68 motherboard.
If you can't ,go with theese parts.
Ivy Bridge isnt to HOT ! i7 is 1k Usd lol i dont evne think to buy a 1000 $ CPU so no way i5 2500k is more than enough. I have An amd 4200 + oc to 2.4 ghz so its nearly the same with that CPu so no sense buying it ...i benched them at anandatech they were near each other so not a good idea.
Thank you anw