There is some great skiing in NH, but be aware that you are giving back a 100 inches of snow a season to Northern, VT.
Cannon (and especially the Mittersill area) is the best place in NH. BUT-it takes a good deal of snow to really bring it to life (and windy, icy conditions are endemic...true Cannon faithful ski it all with a grin, but visitors from NYC, maybe not so much). Lot's of glades from standard New England style expert glades like echo glades, to ridiculously tight trees in global warming glades, to the truly epic Kinsman Glade and the tight trees over on Mittersill. I had a few great days at Cannon last season--but last season was fairly epic.
Ski Wildcat-Best long cruisers in New England. Seriously, it's a cruisers delight, long windy, uninterupted cruisers with a few steeper mogul runs in the middle. As for Glades, forget it-there are a couple over skied glades at the bottom and little else. It's a great girlfriend destination. Beautiful views, easy, very enjoyable skiing, and the great vacation town of North Conway nearby.
Loon-If you like the style of skiing and the vibe of Southern Vermont resorts (Mt. Snow, NOskeemo, and Flatton) you'll really like Loon. It's a little more genteel than those areas, a little steeper in spots with about the same amount of snow and snow making.
NY- Gore is still worth a midweek trip. I love that place, great varied terrain, lot's of funky glades and unusual trails. and if you catch it on a snow day the competition for powder is pretty light.
Maine-You got me, I've never skied there-but the off-piste expansion at Sugarloaf has my interests piqued.
VT-Truth is, if you go anywhere else (NH, ME), you are driving longer for less snow.
You've found Jay and the 'Bush. Throw in stowe and smuggs and you're set.
Also, mid-week, when conditions are right, KILLINGTON (yep, ole K_Mart) stands side by side with any of these places. I don't want to be there on a weekend (or any VT ski area honestly) but midweek in a good winter Killington serves up more great terrain (trees, bumps, steeps, cruisers) than anybody. It's trendy to put Killington down, but evaluated purely on terrain, it worth the visit and is an hour closer.
Oh, and if you want a really chill experience, hit Berkshire East, MA on your way to Northern, VT. It's worth a day visit on your way to bigger, snowier areas.