OSU Sig: I love my Smith & Wesson Model 48's - I can not imagine a better 22 Magnum revolver for reliability, accuracy, cool factor and for an investment!
Go with the Smith & Wesson Model 48!
I have examples in 8 3/8" and 4" versions and have long been searching for a 6" Smith & Wesson Model 48 - people that own these Smith & Wesson Model 48's LOVE them and seldom let them go.
Of course I can NOT recommend the current production Smith & Wesson Model 48's, with the hillary lock, as an investment - they may shoot well but I won't even consider buying one!
Best of luck with whichever you choose.
Hold into the wind
VarmintGuy