Avid,
I had the 45k mi service done at the dealer in September.
Quoted $560 ( paid $578.69 with tax )
My advice is to call around, quoted price varied tremendously by dealer :
http://986forum.com/forums/showthread.php?t=12911&page=2&pp=20
$600 +/- seems to be the norm.
Hope this helps...
Nick