killington is overrated imo, super crowded and shit. they do have some killer bumps in the spring tho.
jay peak will probably have a lot of snow mid-season (assuming el niño has left us for good, they usually have the most in new england). they don't have snow making tho, so i'd keep that in mind if you're going very early or late. i've personally never been, but i've heard great things about it. their terrain should be great too.
sugarloaf is another presumably incredible resort that i've never been to (kill me). a fuckton of terrain and i'm sure the snow is good that far north. also a ton of sidecountry. heard nothing but praise for it.
sunday river (the lifts stop a lot and the new one has an utterly idiotic design regarding wind, but other than that they're good), loon, cannon (will be a less crowded option and further south but more cold/windy because it's in a notch) are all good options too.