I can't speak for the shops out there, since I am in Ohio, but I have been very happy with the build I have done.
IPSMotorsports.net built my car and some other Twin turbo cars. If you are interested in a top notch quality build you should contact them.
Many things done on these builds are easy, but some things really require a detail oriented tech to do the work. With my build we wanted more than any of the off the shelf kits could handle and many custom pieces had to be made. My car has won car shows because the quality under the hood matches the beauty of the car from the factory.
Choose the shop you want wisely and be sure to pick one that has done jobs like what you want done.
You should consider the best shop for the build, if you are willing to go to another state, just ship it to the builder of your choice... there are only a few shops in the country that I would recommend, and 2 are in this thread