I have an opportunity to buy a 95% new S&W 629-1 with a 6" barrel and I'd like to hear from those of you who might have some experience with this model. For about $500, should I go for it or should I get one of the later versions (such as the 629-2 which apparently came out in 1988; or the 629-3 or 629-4) which are supposedly beefed-up to correctly handle the 44 mag load.