I ski on 190cm Chubbs (new style) as my everyday ski. They come in 170/180/190cm versions, and are generally a highly rated fat ski (by many sources). I also have the older (straight) style, which is a better powder ski, but gets really floppy on hardpack. The new style is basically the same shape as the Ti Chubb. At any rate, if you find one of the shaped Chubbs for a good price, you might want to snap them up.
Conditions at Alyeska are variable (base elevation of around 250' above sea level), and the Chubb seemed to handle most of them. I also loved the Bandit XXX, but towards the end of the day (when I get sloppy) it started to beat me up a little. The XXX had a snappy rebound (for a fat ski) that was fun in places, but I liked the smoother, predictable ride of the Chubb. Personal preference.
Right now there are plenty of fat skis out there that have good performance on the groomed and can be used in some areas as a primary ski (the Chubb, XXX, and 10ex come to mind). Unless you plan on doing nothing but powder, I'd avoid a "pure" powder ski (i.e. Atomic Powder Ride) and look for something that is more versatile.
If you can't find a screaming deal on a good powder ski, I suggest you rent or demo on powder days to narrow your search. Then rent or demo those same skis on a less than epic day and see what holds up. Also, check out what everyone else is skiing and try to find out why. Sometimes it's more than just fashion.