Credx2: The '97 is the right choice. I didn't mention it yet but the '97 in 357 is a true six-shooter, not a five-shooter. The '97 in the larger bores (44Spl, 45LC) is a five-shot.
Fixed or adjustable depends on what you want to do.
If you experiment with a lot of loads, you'll want adjustable sights. If you're willing to dial it into one load, or at least one weight class of round, the FA "fixed" sight system is very good.
Here's why I have "fixed" in quotes:
http://gunblast.com/Freedom_NewSight.htm
This is a great setup. You can get varying heights of that front and swap them quickly - even in the field. It's also windage adjustable so you lose very little over "real adjustable" sights.
FA has been making them like this for about a year now. If you find one that pre-dates this front and has a really "fixed" front, you can ship it to FA for this update at low or no cost.
My gun is a Ruger with a broadly similar type of front done up custom:
...and I can tell you, it works REAL well.
The FA adjustable setup can however be customized to an "express" setup, shallow V-notch rear and a gold bead front. This is a wonderful system for fast (read: combat type) shooting BUT it's thoroughly outlawed in CAS/SASS competition.
Upshot: if you're going to use it as a CAS/SASS competition gun, go with fixed sights and if it's used, update it to the latest setup front. For hunting and field use, you'll do best with adjustable. For CCW/defense, I'd say...hell, I dunno, the V-notch rear and dot front combination with adjustable works well, or the newest incarnation of the "fixed" sight is a damn fine setup as well.
(Regarding CCW/defense: that's what that Ruger is set up as, a modern fighting SA. It's not as crazy as it sounds in transfer-bar safety guns like this Ruger or the FA97 as both accuracy and "first strike speed" are wonderful. Only in reload speed does it suffer compared to other handgun systems.)