My Apache Recons are 78cm underfoot and they are quite versatile even in the West. Of course I do have a dedicated powder ski (ancient Volant Chubbs). The Recons were recommended to me by Mitch Kaplan, who is a former president of Eastern Ski Writers Assn. I'm 5'11" and 180 and ski the Recons at 174cm. Mitch is a few inches shorter and skis 168cm. I think, but maybe 160cm.
My son's ski combination would probably be good for many expert east coasters. He has the Volkl Allstar Titanium (70cm. underfoot) 175cm for groomers and college racing and the Dynastar 8800 (88cm underfoot) 178cm for big mountain/off-piste skiing. He is 6'0" and 150. For destination skiing (Alaska last March, Chile next month) he usually only takes the Dynastars.
IIRC Riverc0il, the dean of eastern powder on this Forum, likes the Dynastar 8000. Adam was insistent on high speed stability in variable alpine terrain when he bought the 8800's. The 8000 is probably better for quick turning in eastern woods.
Season length: 21 months, Nov. 29, 2010 - July 2, 2012
Days in one year: 80 from Nov. 29, 2010 - Nov. 17, 2011
Season vertical: 1,323K in 2016-17
Season powder: 291K in 2011-12