Too many variables such as--
Dealer or Indy shop
Rebuild it all or replace or some of suspension
Front and/or rear
OEM or OE parts
You provide parts or they purchase
labor rate

I would say this--I would swallow hard when they told me the price of the suspension work. I would throw up when they told me the price to replace the valve seals. Certainly it will be very important to find a Independent shop with a great reputation.

Need to find a thread about "valve stem seals" replaced for $2500

EDIT: found it Valve stem seals done for $2500! - Bimmerfest - BMW Forums