I had a GP100 stainless 6". That thing was dead-nuts accurate. I regret selling it. Wouldn't mind another GP100 in my collection though.. but in exactly what you got (stainless 4").
The 6" model definitely looks extremely vulgar. 4" model I feel, is better balanced. Even though my 627 either weighs more or is about the same weight as the GP100 in 6".. it feels lighter simply by virtue of being better balanced. Think you made the right choice for an overall revolver. I'd only get the 6" for hunting or target shooting.