I can't help much with diagnosis or labor, but with prices for parts I can help a bit. Call 1-800-vw-parts. They're in NY and ship COD. They offer new and reman parts that are actual VW parts (unlike auto zone or similar). They've also got prices I have yet to beat anywhere else. Seriously, these guys have kept me in my VW much longer than I would have if I still had to go through Kragan or the dealership.