At my local machine shope complete Balancing within .25 gram and piston crown deburing was $340
1) spin balance Crank, flywheel, and crank pulley
2) debur and smooth piston crowns
3) match weights of all rods and pistons
All my parts were new after market so no hot tank, but I think its runs $35/hr
As for coatings and their purposes and prices check
Swain Techniques 
