Move to Truckee to ride Squaw and Alpine - or at least Sugar Bowl... not Northstar. That place is a joke. What you're saying is basically like going to New York City just to see Times Square. I'd almost rather move to the East Coast than ski at just that place.
That said, the average cost of rent on a place is going to be around 500ish - unless you want to live in a hole, that is. Sierra meadows, Tahoe Donner, Glenshire, and Prosser are all neighborhoods to search in... If your'e adamant about skiing at Flatstar, you could also do Kings Beach, which is on the lake.