I have thought about this setup also for awhile.

My system has 12gb RAM installed on a EVGA X58 and 965XE cpu using Win 7 64bit.

12gb of RAM is hardly ever touched if at all so much of that RAM is sitting doing nothing.

I have tried turning off the page file but some games or what not require it to be on. What would be the correct page file size then ?

Win 7 recommended page file size is 18418mb LOL !
I have it set to 6gb atm but I think going even lower to say 1 or 2 gb would work fine.

I know 12gb is like a lot of RAM but I had the sticks so why not
What else could this extra space be used for then, a RAM Disk I would assume. But could you install programs on that and have it there after you reboot, say a recoverable RAM Disk ?