I have always liked the 3" models. The extra 1/2 - 1 inch of barrrel length is insignificant in terms of concealment but allows a full length extracter rod. This becomes very important if you ever need to do a quick reload. As far as a carry load the FBI load (Remington 158 Lead Semi-wadcutter hollow point +P) has a very good track record and works quite well in SD situations. This is another advantage of the 3" barrel as you will get additional velocity from the +P that a true snub will not deliver.
If you intend to CC the revolver you might look at the grips offered directly from Taurus.