I currently have a dan wesson 15-2 with the interchangeable barrels in 357. I have the 4" and the 6" barrels for it. I have the opportunity to buy (cash and carry) A ruger gp100 4" blued (Lnib) A Smith Model 10 in 38spl in excellent condition blued pencil barrel. I'm thinking the dan will become more rare as the days go on. Is the smith worth buying as a collectors item/investment?