All of my dies are 4-die sets. In rifle, I decap/resize, flare with a Lyman "M" die, seat the bullet, crimp. I shoot multiple rifles in the same caliber, so always full-length resize. I've found that some powders (like ww748) burn more completely with crimping. I like Lee FCDs- some people don't- thats' ok. I have a couple of undersize dies. Because of batches of thinner brass, I asked Lee to ship me "U" dies in .38/357, 9mm, 40 S&W. Just call customer service for this. I think it's a false economy to go the cheapest way with tools. Better to have a die and not use it much than not have something that would make life easier.
Loren