Both the Thug and Prophet are good fat skis. If you really want fat, though, you should check out Fat-ypus. Small Colorado company, fattest skis on the market for 2007 and the skis perform well. I'd like to own a pair myself. Their website is www.fat-ypus.com
Oh, and so everyone knows what we are talking about here, these are the dimensions of the skis in question:
Atomic Thug: 140/120/133 @ 181 cm
Fat-ypus A-lotta: 172/140/158 @ 180 cm
LIne Prophet 130: D: 155/130/148 @ 186 cm
All of 'em are pretty girthy underfoot, that's for sure!
It's called skiing, stupid.