My ideal set goes like this:

RCBS/Redding FLS
Lee Collet Neck Sizer (or Hornady New Dimension Neck Sizer if Lee doesn't make a CNS for cart in question)
Hornady Seater
Lee Factory Crimp Die (if crimp is necessary)

I only use FLS dies once (if using range pick-ups) on bolt rifles. Between the Lee Collet Neck Sizer & Hornady seater I doubt I could get much better concentricity, even if I spent 2 car payments on a set of Redding Comp dies.

The Lee CNS doesn't utilize an expander button so not only do you get maximum concentricity, but they also extend case life cuz you're not working the brass so hard by squeezing it down then expanding it back out. Many say you'll have to bump the shoulder back once in a while, but I have '06 cases that have been resized w/ them over 10x w/out that need.