I hate spending money on extras. I assume one is starting with an as it should be set up with case feeder and a mount.
My most productive upgrade was to buy 5 extra primer tubes first off.
The light was like 12 bucks at target. It has a big advantage over the rip off priced in frame lights, I can point it wherever I need it, like my hands if I need a good look at something, it is LED super bright. I don't see a light as an option though, it is a must.
FA vibra prime, once cleaned up(molding lines) it works as well or better than the original, for almost no money compared to a rf300(I see it as the same thing on a stand, but hugely overpriced). I fill up 6 tubes with it and I am set for a leisurely hour of loading.
I have a bullet feeder, but I just don't need it for most sessions.