hancoveguy...
Best boat detailer on the lake is John Spooner of Diamond Shine! In fact my Donzi is there as I type this. He has long list of excellent references, (he does almost all of the Hi-performance boats on the lake) does a fantastic job and is insured! Tell him Woodsy sent ya!
http://www.diamondshinenh.com/
He also does winterizing and shrinkwrapping if you plan to store the boat outside this winter.
For GPS... these guys are spot on! You want a GPS that takes the C-Map chip of the lake. I have a Standard Horizon and it works great!
Definitely go with a Bunk type trailer. Your boat is heavy and will spend quite a bit of time (off season) on the trailer. The bunks are measurably better for the bottom of the hull...
Woodsy
PS: Was this boat owned by guy named Steve?