Many of these have already been noted:
In general the appellations to look for are Dry Creek Vly, Howell Mtn & Amador Co.
Also, the 99s are very nice and should age well. I've had a number of 15+ yr old Zins that were quite nice (Lytton Springs & Rafanelli come to mind). I routinely drink 'em 10-12 yrs old. That doesn't mean all Zins will age well. And it depends on the style you are looking for. But with the right fruit/tannin/acid balance they can go for awhile.