Need recommendation to Finish my rig.

[Guest]

Processor: Intel Core i5 3570K 3.4GHz Ivy Bridge
Motherboard: Asrock Z77 Extreme 4
Memory: Corsair Vengeance 4GB 1600MHz DDR3 <-- can i up this to 8Gb? any negative effects?
CASE: COOLER MASTER ELITE 431

USE:
Extreme gaming,OC,server,rendering,dual monitor.

Is this right or do i have any miss match or incompatibilities?
Any recommendations?

Hope someone helps me.

 

[Lutfij]

i sent a link so that you can check out its review:
http://www.techpowerup.com/reviews/Fractal_Design/Core_3000/