With the kit, I think you're on the right path. The Four Star has a long tail, so a small savings back there equals a lot more up front.

With the ARF, it is what it is. We can move the engine and radio gear some; then we just have to add weight if necessary. I exchanged the open foam wheels for rubberized ones, and have an aluminum spinner I can use. If that's not enough I'll bolt on some lead.