I haven't been with the Monarch operation, but I've heard great things. Steamboat PC is a first-class service with awesome terrain, and they have a lot of accesible acres. The guides are first-rate as well - print out the Buzz' "Joke Wars' thread for the rides up. I think it's a little more pricey than the Monarch trip, but worth it IMO. I had probably the single-best ski day of my life on Buff Pass - 3' the night before. We logged 16 laps that day; so you get your money's worth.
Pack your Snow Sweater
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Of course these cats book up long before you can start predicting the weather, so it's a crap shoot on whether you'll have fresh snow- but the cold temps up north keep the snow light long after the last dump.