As to what will be a good buy, next March, to be honest, your guess is probably as good as mine. I terms of today, it's a perfectly reasonable build, but as you don't state any particular uses, for it, or any budget limitations, it is, with respect, difficult to come up with any constructive ideas.
The new Haswell chips are due out 2nd quarter of 2013, so, by the time of your build, things may have totally changed, or be about to!
My budget is $650 and it will be gaming for WoW on Max Settings. But what i mean is that ill have ALL the parts by March or so. But i will by the cheapest first and leave the GPU and CPU for the end. Should i just change the chips?