Hi,
If this PC627 is being purchased to shoot, and not just be a safe queen, I'd recommend some nice Elk Stags by the forum's own Patrick Grashorn (aka "Executioner" in Cowboy Shooting Sports). I really like the ones I have and they look and feel great while also being durable!
Combine them with a Tyler T-grip and the feel and the recoil reduction is marvelous . . . and they look cool in a retro way! Plus, he makes 'em the way YOU want them to look AND the size to fit your hand that you ask for. Better still, his turn around time is usually a couple of days or so . . . and your grips are uniquely yours! He will even send you photos as they progress for input/approval if you wish!
Here are some on various finish guns of mine:
A second option I like, are the Hogue "Monogrip" wood grips. They feel great in my hands.
Here's a set of Hogue "Rosewood Laminate" grips on a Model 646:
and a set of Hogue "Camolamo" grips on my Model 29-5, a hard-kicking .44 Magnum, stoked with 300 gn. hardcast lead flatpoint bullets. It is quite comfortable to shoot, even with this stout. heavy load: