I would not encourage you or anyone else to go to the expense of installing sling studs and swivels on it. A good holster will protect it better than banging around exposed to the elements. I say this with some experience, having such sling swivels and studs on 8 revolvers...but I haven't put any on since about 1999.
I have FA's in both barrel lengths you mention, and like both. Since you're going to scope it, I'd probably select the 7 1/2", but this truly is a matter of personal preference. My scoped FA's all wear Leupolds, and 3 or 4 rings, depending upon caliber. You can't go wrong with a T'SOB, but many also like the Lovell.
I personally haven't found the 3# trigger job to be essential on FA's, but several of mine have it, and James is right: they're nice.
THe micarta is indeed tougher than the laminated wood. You might consider getting the tan micarta, which gives an appearance somewhat simulating ivory. I like mine.