If you can locate a Match Champion, IMO it is worth the cost difference over a standard 4" GP100. The factory trigger is indistinguishable from my gunsmith slicked Ruger, the sights are nicer, and arguably the grip is better. The half lug and chamfered cylinder are nice, as well.
On the LCR, I elected to get the .357 version. It's a fuzz heavier, but it lets you run your primary's ammo in your backup if you are carrying the GP100 and the LCR. It's also not bad to shoot recoil wise with 125gr .357s, although 158 grain full house .357s are still a bit much for my tastes.
Thanks.