I know a young guy who bought a NIB SS Python several years ago and went straight to the range to shoot it. He paid over $1,200 for it - possibly close to it's optimistically marked price of $1,500 - he never said. I was not impressed. I let him shoot my JM PC627 V-Comp... he was impressed, exclaiming, several times, "Dude!". No, I wouldn't trade... although I did eventually sell that gun. My 4" 627 Pro - and that pair of 2 5/8" PC627 UDRs, one bought with the V-Comp's moola, which I bought last year, are 'close enough' to perfection for me. If you want a better trigger, S&W's PC Shop will do a 'master trigger job' for <$200 inc overnite s/h both ways. That leaves you enough from that $1,500 to buy a NIB 642 for the pocket - and some ammo.
Of course, it won't have the allure of a Python... for that, it must be a Python! If you get it, you'll likely love it - and the price paid won't matter. You simply cannot pay 'too much' for a desired, and good, revolver. You can, of course, pay too much for a turkey!
Stainz