If you are willing to drive around 3 hours Blue Knob in PA has some pretty decent terrain... unfortunately they don't make much snow there (if any) so you really need to check their conditions closely.
Best weekend trip is probably Snowshoe, in West Virginia. It is fairly large and gets a decent amount of snow. Only a couple of trails are expert level and getting there can be a tough 4 hour+ trek but it has enough variety and good enough conditions to qualify as a good weekend destination.
If you want to find anything even approaching Tahoe standards however, you'll want to head for an airport... it just ain't happening in the mid-Atlantic region.
But overall, I'd say Snowshoe has the best reliable in-bounds terrain. Timberline comes in a close second, with Off-The-Wall offering up steeps close to those of Lower Shays, its just getting there when its got good snow. Of course, if you know where to go at Timberline, then Snowshoe's got nothing on them (other than good lifts, service, and food).