Weeeell. I know ppl run 6800GT's and similar in those babies (tho I'd rather go with the 6600 gt 'cos of heat n' stuff), it's actually a quite competent PSU, good 12v rail they say. Seems the PS reqs aren't the same with a mobo like this.
It can be a bit of a puzzle to assemble, and it only fits one 5.25 drive and two 3.5's according to shuttle, but you can fit another underneath if you really need it, tho' it gets hotter. And there's only the one pci slot.
But it's really lightweight, n' thus good for LAN parties, and the sn45's ship with the best integrated mobo on the market as well as a network card.
It's not the only sff that seems good around either, I think BOT is running something a little bit bigger, and then there's the
http://www.silentpcreview.com/article146-page1.html antec aria case, in which you can fit a mATX mobo if you can find a good one, if you find the size appealing.