I'd go with the 4" 6 shot, rather than the 7 shot. That way you could compete in IDPA.
Hmm I was wondering why the 4" barrel was more expensive than the 6. I actually preferred the extra weight of the 6" barrel, but now I'll have to try and shoot both before I make a decision. I wasn't really thinking of competition yet but that is good to keep in mind.
Thank you.