You could probably do quite a bit of the service yourself and just have them do the major stuff. Definitely see if the shop will allow you to buy the parts elsewhere and bring them in...that will save $ right there in most cases.
Boxster Maintenance Schedule
Halfway down the page...post by Insite .... lists Atl and surrounding area shops.
http://986forum.com/forums/showthread.php?t=9615&page=2&pp=20
I use
Roock AutoSport who did my 3.4 conversion.