So I just got back from my 6k. $722.61
I used to work with the dealer principal and know the techs so I grabbed some info while I was there for all who care.
Let me preface this with while I can do all my own maintenance, I decidedly wanted to have at least the first (major) service on record at a BMW dealer for warranty purposes. I say this knowing damned well the hourly was going to kill me.
According to the tech, BMW calls for engine oil and filter, trans fluid, air filter, brake fluid flush, and valve tappet clearance check. He invited me in the shop several times through the process so he could show me the various processes and steps involved since no service manual, and let me hand pick the processes since they know me.
I opted to not have the brakes flushed as I just did bars over the winter and flushed the system then. I also opted to not replace the Head cover gaskets, at $166 / ea, after the tech showed them to me. They are 1/8" thick steel with formed rubber seals. Really heavy duty, and honestly, if they arent marred or damaged in some way, I could see no reason to replace them every 6k miles. Especially for the $330 it would cost....
That said, all of the parts and fluids used to complete the 6k service, minus brake fluid and head cover seals, ran up to a total of $152.09. This is of course unsing "Genuine BMW" fluids. Add in the gaskets and brakes if your dealer wont let you opt out.
Labor was $553.90 ($145 / hr) at 3.82 hrs. Tech told me the BMW manual quotes it at 3.5 hrs. Take that for what it is worth.
Seeing the service steps, most of what needs done is incredibly simple. The most difficult part seemed to be the trans fluid as the filler point is buried and not easily accessible (per manual change 1st time after one year then every 24k mi). The Air filter is some what time consuming to get too, but not difficult, so if you can, swap it for a reusable, and save the step in the future. valves are easy to access, 0.02 - 0.03 per spec as someone else said is what I was also told. easy to adjust as well.
If you have the ability and the space to do the work yourself you can certainly save lots of $.
My paper air filter wasnt too bad (I would say this could easily take 10 - 12k of riding before changing), so get a washable, and clean it as needed. Trans and brake are once after 1 yr then every 24k mi / 2 yr respectively. Then do tappet check and oil every 6k, plugs and rear drive oil every 12k. and you'll be rather golden, and save yourself thousands at the dealer.