ARF or kit?
Yup, if you have 4 ARF's under your belt, go for the kit. The Sig kits build well, and no one yet has convinced me that there is an ARF out there built better than I can build my own (granted, I've been building kits since the 70's). Once you get your first kit under your belt, the next, and the next... they are all easier. Also, when you have a big "Oh, No!", repairing is much easier, and less intimidating once you have built one from a kit.
Lee