If the price is right, go for it. They're good guns. I particularly like the stainless steel models with adjustable sights. Ruger made/ makes the GP100 in a .38 special only version. I had one with fixed sights and it must have been a forerunner of the SP101 as regular GP100 grips wouldn't fit. Had to go with SP101 grips. If yours has the wood inserts, you can get creative. There used to be a guy on the Ruger Forum who sold exotic wood inserts of very high quality.

Regardless, go for it.