Keep in mind that there are basically two ways to go here. The absolute smoothest and lightest action job will be one that is set up for competition shooting. With this type, you'll need to stick with Federal (or Winchester) ammo only or risk failures to fire.
The next level up, would give you a heaver pull but allow you 100% ignition with any ammo.
I do most of mine myself but also own one done as a Competition job by Clark Custom which is ultra slick.

p.s. The 3" 686's are sweet. I have a 3" 686+ Talo version myself.

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Dave