Is this something that you already have assembled? Looks like a nice, balanced system. Only upgrades I can see in your immediate future would be an SSD, aftermarket cooling solution for overclocking the cpu, and eventually a new graphics card whenever you play a game that requires more ass than a 560ti someday down the road.
If this is something you haven't built yet, I'd say go with a seasonic built PSU over OCZ but that's mostly related to my fear of OCZ power supplies and their history of frying :x Might not be an issue anymore though.
The addition of an SSD as a boot drive would speed up your Windows load time (as well as whatever else you deemed important enough to put on it) but it really isn't a life changing addition. Just a neat toy.
To me that looks like the next logical step hardware wise. Nice case by the way.
What would he gain aside from caching via the SSD he doesn't own (and a feature that no one uses with limited write lifetimes on their expensive SSD's anyway) by getting a Z68 board? It's not like he needs access to intel graphics. There's no reason to replace a P67 with a Z68.
I can't really see that for the time being that you need to up grade anything. You have got a good gaming rig. Now down the road, yes there is room to up grade. You could add an SSD drive about 120 gigs.
But I don't need one and I play games just find. You could change your GPU to a GTX 660 ti with 2gigs of Vram. Your monitor either two of them or a bigger one. 24inch one's are the best.
For right now like I said at the begining. You have a nice gaming rig. You will be able to play all of the top games with desent fps. Now the only thing to add is the games and some softwear.
You need somehing to monitor your temps and FPS. Something to watch your temps on the CPU and core temps. I will link you to some stuff that will help you if you want it and I will you the best with your nice gaming rig.
One of the programs will let you OC your GPU if you want. That however is up to you. I hope this will help you and good luck.