I just googled Healdsburg wineries to see whats around and these are the nearby wineries whose wines I drink>

Twomey
Ridge
Selby
Jordan** (a spectacular winery with great wines)
Gary Farrell
Chalk Hill (good chards)
William Selyem (great pinots but dont think they have a tasting room)
Ramey

Of all of these I would put Jordan on the dont miss list.