Looks like plenty of good advice on skis that like powder. Wider under foot is better. Also, think about a couple of technique points for powder:
1) Surf - pull your skis up to the top of the pow while you're making your transitions
2) Weight the back foot 65% and front foot 35%. On hardpack you should be 50-50, but in pow, keep some weight back. Again, this will keep your front ski surfing rather than diving.
3) Quiet upper body that floats down the fall line with shoulders committed to your line while your legs swing underneath you.
Check out www.telemarktips.com
for some great video clips and critiques.