Valhalla is the best price on Cat Skiing and their terrain is sick too. Mustang, Great White Northern, Retallak, and Chatter Creek are some of the best cat ski ops - but much more expensive.
Eagle Pass heli-skiing is very good and caters to snowboarders too. CMH is a huge op with vast terrain and many lodges. Rice did his filming for the A-of-F at RMR resort, RMR cats, Selkirk Tangiers, Eagle Pass Heli.
There aren't many ops that do single day (Valhalla and Tangiers both do).
You really can't go wrong... there's about 20 cat ski ops and 10 heli-ski ops - all with really awesome terrain and a bunch of snow. The mellowest ones would be K3, Caribou, and Big Red.