Well I'll tell you to me and this is from my personal experience. One of the best all around S&W's is either a 4'' Modal 681 or a 581, fixed sights all the way and the full under lug barrel to aid recoil with full house loads. and for those folks who don't like the extra weight a Modal 64,65 or any of those bull barrel fixed sight Modals the only modifications that I would recommend would be is milling off the front sight and dovetailing it adding Trintium Night sight and drilling two in serts for the rear.