Land Rover Repair: Range Rover Suspension, range rover hse, repair mechanic

Question
I have a 1998 Range Rover HSE and the Air suspension just went out.. it was expected as i have heard its common with these vehicles.
I have 67k miles on the car.  
I am wondering should i have the air suspension replaced or change the system to coil springs. Also what should I expect to pay for either types of repairs?
I only use the car to drive around town, no off road.  
(Also, i am in Las Vegs, if anyone knows of a good repair mechanic that can do the work please let me know)Thanks.
Troy  

Answer
The air spring oldered after 7-8 years. You should change all! the air spring for new ones if you want to keep the car , otherwise you will get many-many problems. For example they can kill the compressor.
So, the 4 air springs const about 800-1000 USD, but trust me, this is the most preferable solution...