Skip all of the foofy crimp dies and such until you know you have an issue. Properly adjusted 3 die sets will produce good reliable ammo if they are set up right. No sense buying something you don't need. If you go progressive, you will want a seperate crimp die. With a single stage set-up you can seat all bullets then adjust the seat die to crimp in a separate step.
I agree with this except if you know your are going to be shoot cast pistol bullets. When you buy them in bulk they are not always consistently sized. I recommend a Lee Factory Crimp Die. The main reason is it has a carbide sizing ring that will ensure your rounds are more consistent and reliable. I have been using one for about 5 years now and it has paid for itself many times. If you just shoot jacketed bullets or cast ones you know for sure are sized properly don't sweat it.