[Pyrotechnic]

Well as long as you're not overclocking or needing tons of expansion space, i dont see the problem with mATX as long as you buy a quality motherboard. By all means, make sure you get a case that can take a full size power supply, and run a good power supply in it. Those small mATX are great space savers for lower power systems, but they just spell instability for any newer motherboard and processor. I actually had an HP mATX system that someone brought in to be repaired, it would always lock up under load. It was an Athlon 1.0 Ghz system I think. It had one of those mATX PSU's in it, so i disconnected it then plugged in a full size 300W power supply. After that it was stable under load. Then after a little massaging to the casing of the new PSU, I was able to get it to fit into that tiny case. The original power supply wasn't bad, infact it's running in my router right now (P2 333), it was just too small to power that system under heavy load.