It's hard to say. I like both. But I would say the FNP since it will fill in the area we would see things like the USP. As for the raging bull, based on the stats you put, I think it would be better suited to something like a S&W 500 with a scope, so it would look and act like a hunting revolver. But that's just me. Overall I would pick the FNP, and save another revolver for later.
3 semis and 1 revolver would be pretty balanced, since revolvers are usually less common anyway.