You can buy coated bushings directly from Redding. The Redding/Wilson dies use the same bushings, IIRC all the others use their own design. The plus to the Neil Jones is the bushing includes the shoulder, the minus, of course, is the cost, and that you are committed to his bushings.
If you are interested in JLC's dies, call or send him an email.
Finally, if you are only interested in neck sizing, you can make a sizing die from the chamber reamer -- just start with a Wilson neck sizing blank. Or, as was mentioned, the .280AI die will most likely work for neck sizing only. If you ever want to bump the shoulder though, you'll need a different die. And my experience with the 6.5/06 AI (quite a bit) is that you will need to "bump the shoulder."
FWIW