I'd suggest the FL die, preferably a bushing type die like the Redding Type-S FL die. The Small Base dies won't cause you any problems (and may even save a few), but you likely don't need them unless you're running a gas gun. Even there, they aren't always required. Save the Neck Sizing die for some time when you feel you don't have enough aggrivations in your life. Use them, and at some point they'll add some new frustrations for you. You'll need a FL die to sort them out, so why not just go there to begin with and save some cash?
Don't forget to consider a gage, either a chamber type or bump gage, to help you set the dies (of whatever type) up properly to begin with.