Elder,
Check out Fox Meadow in Linden. Nice drive up, paved driveway. Nice view a-top the mountain. Good wine. You can wander through Upperville, Delaplane, Rectortown, etc. on nice back roads getting there from M-burg.
Chrysalis - haven't been. You've heard the 'story' of it's orgins, right?

Sweedenburg - haven't been, but never see much activity there. Both are off Rt.50 East of M-burg.
There are 1 or 2 new ones off Rt.55 West of Marshall - might be worth a try.
The following are good wineries, but unfortuantley have 'challenging unpaved' driveways; Linden, 3 Foxes - Delaplane, Mediterranean - Warrenton.
I wish my car wasn't in the paint shop or I'd be there!!!!! Have fun!