Go for this, and since it seems your on a mid budget, I'll put in some good quality parts for you.
Coolermaster Hyper 212 Evo
Asrock Z77 Extreme 4
Ripjaw G.Skill 8GB 1600 Mhz
Coolermaster Elite 430, You don't need a case that big
HD 7870. Look, your putting pretty high end equipment, with a not very new graphics card. I wouldn't recommend it.
Keep your PSU, as long as you don't run it at 100%, it should be fine.
Seagate Barracuda 1.5TB 7200 RPM
Whatever DVD writer you want.
Yes I' am building the PC for gaming and rendering purpose only ... and the unfortunate part is .. I already have that GPU 5850 .. can't buy another .. plus budget is too tight .. and I don't think I'm going to compromise with looks ^_^ .. by the way is I5 3570K better than I7 I mentioned ? and guys really thanks for help