Thanks for the leads, folks... I ended up giving "Overseas Service Haus" in Frisco a try.

• Service II with spark plugs: $495 (Classic BMW: $740.34)
• Brake fluid flush: $0/included (Classic BMW: $137)
• Alignment: $95 (Classic BMW: $150)

They also mentioned they use the BMW recommended synthetic oil for the service work. (I didn't get the specifics but I think it was Castrol Syntec?)

I'd have to double-check, but I think the spark plug service/parts is an additional $272.80 from Classic BMW also.

Other minor things... courtesy shuttle to/from work; basic car wash.