Also check out:
Snowshoe Sales and Repair Ontario, Canada(google)for their 400# monofilament weave and ratcheting pivoting binding(great traction).
mgsnowshoes.homestead.com They sell a great snowshoe and also a star shaped ice cleat.
You will want the traction of the cleat and binding an anything beyond level. Get the best of new and old school.
An old pair of Lund 10x56 Alaskans can be found on the big auction and relaced by the above people. The old Lunds have a big upturn in front that won't nose dive under powder.
Bigger is better for powder so you don't sink to your knees with each step.
The modern crampon style with aluminum and plastic are better for steep,crusted,and icy snow.
One snowshoe will not handle all conditions IMHO.