Hey I agree partly with Makubex GB,
I have a 175 Opty. The Key here is balance, grasshopper. everything you put in your rig matters. So a fast CPU and High OC with slow HD and sucky Ram gives you WTF rating from yourself.
I built my rig on the way I'm going to use it. I OC'ed the rig based on the most rock solid method I found for the entire system. I have the speed I want, I have a Rig that will last for quite some time since I'm not trying to kill it.
So my 2cents says: Balance the system with more thought.