Replying to East Coast trip

I've been debating taking the oldest kid (12) on a ski trip somewhere either this year or next, depending on money, his attitude and how well he progresses with his skiing. I've been to Attitash, Sugarloaf and Marble Mountain as far bigger east coast hills. I'm wondering if there's one that someone might recommend more than others.

He's been skiing for 3 years now but has only seen our monster 600' vertical local hill. He has come along nicely though considering he's only been out a total of 5 times.