I would get the Lee Deluxe dies. The ones in the yellow box. It has the the full length sizing die. The Collet neck sizing die. The Dead Length seating die. As well as the crimp die. The seating die, and the Collet die are what makes this a great die set. No lube needed for neck sizing, an the seating die only seats. No crimp to worry about. I have never used the crimp dies.
I have the RCBS FL set at the moment, and it works just fine. Though I am going to be ordering the Lee set as soon as I have the funds to do so. I will then sell the RCBS set.