I highly recommend Alan Harton. He works primarily or exclusively on single action revolvers. I sent him another revolver yesterday. Following is the work he performed on one revolver previously: Recut trigger sear,recut full cock notch on hammer, polished transfer bar, installed lightweight trigger return spring, installed lightweight mainspring,reduced power of pawl spring,made and installed a patridge front sight blade and test fired. I don't want to quote prices for Alan, but this work plus shipping would probably be about $200.00.
If you are going to keep the firearm and shoot it, I highly recommend it. If you plan on selling or trading - you may or may not recover the cost of custom work. It would depend on the buyer. As in all things in commerce, it is worth what someone is willing to pay.