Make sure you do some research on any new PSU you buy; wattage means almost nothing these days.
A forum I use that has a lot of people who take power supplies very very seriously.
http://www.hardforum.com/forumdisplay.php?f=93
"Watts don't mean jack"
http://hardforum.com/showthread.php?t=779582
On the voltage you're seeing now, 10.8 is HORRIBLE, but the other numbers seem alright. My system is pretty much always stable within +/- 5%. So...
3.135 to 3.465 on the 3.3V,
4.75 to 5.25 on the 5V,
and 11.4 to 12.6 on the 12V.
Lots of draw on the 12V but you look fine otherwise..