Its been discussed,AT LENGTH,on TGR. Search there.
Its gonna be difficult finding "the best terrain,best snow,and cheaply." Chances are,your probably gonna be satisfied wherever. I've flown with Chugach Powder Guides and was definitely satisfied but would love to fly with Points North from everything I've read.....it ain't gonna be cheap though. At CPG though,you have the option of doing single days for slightly less than a grand....And having the snowcat for backup on those days that you can't fly cause of weather....inevitable