The more raw cpu power you have per core the better for your frames when combined with a decent graphics card.

SSD for fsx is the way to go but it wont give you more frames per second but improve the loading time of the sim and thats about all it will do.

I run windows and fsx on there own ssd drives and the improved loading time is well worth it even more so now that ssd's have had a massive price drop as i plan to buy 2x 256gig ssd drives and raid them for fsx/p3d and buy a 128gig ssd for windows as the 60gig one im using atm is a little small.

When you buy your first ssd.. use it for windows as the boot times will blow your socks off :)

but yeah fs_addict that build should do you well and give you some nice performance :)