I have owned dozens of handguns - many of them fine custom jobs.  My old eyes just don't work that good anymore - the pleasure of shooting handguns has faded away quite a bit, and so I have been reducing my collection to the real KEEPERS.  Like some others have said - the last one to go will be my GP100.  It's the one I have used the most, had absolutley no problems with, outshoots anything I have ever owned, and the grip fits me like Bill Ruger designed it for me.  Overall, an extremely robust, easy to maintain, well-designed, and accurate revolver.  An inexpensive Wolff spring set will lighten up the trigger if you so desire, but not necessary.  I have had mine for 15+ years.  Some custom smiths used to (probably still do) convert them to 5 shot .41 mags.  I lusted for one of those for many years, but it was always very expensive.