Replying to Driving out to Washington this January, resort suggestions?

I *might* be driving from NH to Washington this winter to visit a friend near Seattle and I thought why not throw a little skiing in the mix? Obviously being out west I'm looking for good powder/trees, last time I was out there I was at Alta. I'm looking for some suggestions on places to ski in the area, the two big ones I already know about are Mt. Baker and Steven's Pass. I know the area around Park City is full of ski mountains, so you can jump around there pretty easily. I'm not sure if this is the case in Washington. I'm doing some searching right now, but obviously you can't beat local knowledge. Any suggestions/tips would be appreciated.