Waterville does indeed have a 70 footer, their jumps are on point from what my WVA friends tell me.
Killington is in the middle of opening what will no doubt be the most fun Dream Maker ever built, the rail section looks unbelievable already. (trust me-home mountain)
Sugarbush is KILLING it this year too, they've got a 25-35-40 foot jump line going, and some of the craziest rail features I've ever seen. I'd say those are the top 3 parks on the east right now, and then of course Mt Snow always has enough features to last a lifetime