Liondog,
It depends on what you want but i would highly recommend you do it yourself or be very careful where you go. The dash removal on a gen 2 car is not trivial ad you MUST tape the a-pillars or you WILL scratch them...
also the stock stereo does not use RCA or standard speaker wires... the shop will have to make their own harness or cut up the stock unit: not so good. also the wiring plug is hard to find so many shops will cut the plug right off the stock harness.
I did all my own work on the ACR and the previous owner had a shop install things ... what i found was terrifying to say the least.
Professionals may not all care about your car as you do... and how many pros actually have solid training on a viper let alone other cars? Shop manuals? If you want copied pages for the dash removal, etc i may be able to get them for you...