Because I need the extra space to upgrades and all.
Buying something for futureproofing never works out as planned. You'll then end up with a MicroATX motherboard with no case to put it in and have to sell it. My advice would be to buy for now, not for 3-4 years down the line.
Also, for the heatsink.
Most MicroATX cases are just as wide as ATX cases. They also have the same motherboard depth. MicroATX does not inherently reduce the space available for a heatsink.
What do you think about the HAF X M?
Looking at the design I'm not sure silence is really a goal of it. The big side vent will also miss the point if you put a MicroATX motherboard in as the fans will not be blowing over much of the board. Looking at cooling performance in some reviews, it's not the best either:http://www.bit-tech.net/hardware/cases/ ... m-review/3
It's a very 'gaming' orientated case which means big headline features and big dimensions. It's far, far bigger than the requirements of the components you are putting into it.
And about the PSU, i was thinking of this one: Corsair GS700 700w 56A
You think it will be enough? I don't plan on overclocking soon, maybe later, in 2 or 3 years maybe.
That's far more power than you will need. This system will draw perhaps 350W max at the wall even when overclocked. Save yourself some money and get something around the 500W mark.