It really depends on what your expectations are. If you shop buy what is cheap you can get out pretty cheap until you have to replace parts or upgrade parts or buy what is missing.

If you like to have someone that is quality minded and does a great job while working on your car its going to add up. Same as when shoping for your system. if you are the type that wants a quality,complete system it will add up as well.

A good set up with the normal accessories will be about 1000.00. A good quality shop is normaly going to cost anywhere from 500 to 800.
Dave