ASRock Pro3 vs Pro4 vs Extreme4 Z77

Hello,

So I'm going to be going with the following build:
CPU: i5-3750k
GPU: 7850
PSU: 750W http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Case: Fractal Design R3
RAM: 8GB 1.5v DDR3-1600 CAS 9
HDD: SSD

So I'm deciding on the motherboard. I'm on a budget, and the Extreme4 is already pretty pricey for me, so I would like to know if I can buy the Pro3 and not be disappointed. The main difference I see is that the Pros don't have gold caps.... does that do anything? Here's a link comparing all three: http://www.newegg.com/Product/Productcompare.aspx?Submi...

If you have any other suggestions, go ahead and make them. I was going to go with the Extreme3 Gen3, but then IB and Z77 came (coming) out. What do you think? What are the differences?

Thanks!