scn20 with a new stamps is 13.5"... I would prob pick up the sy100 13.5" model
I don't remember seeing a SCN20 only the SCN20W??? But I agree with you on the SY100.
If the OP likes 13.5" barrels and a one piece feel:
1) SY100
2) B2 (either 2013 or 2014)
3) SCN18
that's what I ment the 20W
20w is a 12" barrel.