The SP101 MC is only $90 more MSRP as shown on Ruger's website. You get a target crown too. If one likes the grips then I'd get it over the standard 4.2 inch barrel. I'd throw a 9 or 10 lb hammer spring on it and be done with it. If you don't like the grips then I'd skip it and do my own trigger work as the OP did.

The GP100 MC was a nicer upgrade imho than this new offering. It also has a slab side barrel, half underlug and the option of fixed Novak sights. I picked up a barely used fixed sight model and it's awesome. After installing the 10 hammer/8 return springs it is the best revolver trigger I have shot.