The prices vary GREATLY amongst different dealers and locations. Quotes I received last month for 12 and annual was $600 to $700 to $400 range (without value check). Still amazed at the cost difference between my local extorsionist and with folks like htheater.
You can piecemeal items, just ask them how they charge for them, usually they go by the book for time....believe valve check I received was 60 work units, 12 units per ~hour, ~5 hours. Hourly rate of $70, so $350 for valve check and replacement...no replacements, was about an hour less, ~$290. This would be why I decided to do my 12k valve check, and everything else myself (costing me $26 bucks for a new gasket and $4 for sealer). Next time I will probably have to replace one intake tappet, but one saturday afternoon of my time is well worth saving $300 bucks.
Brake flush is 35 units, ~3 hours, $210. Going to wait until it I have actually had it year (so spring time) before I do it.
Fault code check and brake bleed down test (something you cannot DIY) from my dealer is a minimum 30 minute charge (even thought it takes them less than 10 minutes of work), ~$40 with taxes.
Annual will usually be cheaper if you have it done with other service/inspection.
For my DIY maintains costs this year (just the parts and the fault check/bleed test):
6k service - $100
12k inspection - $200