I'll happily second the referral of the Ray Brandes' Moon Unit Indexer -- and his case kicker too, both now manufactured by SBS since Ray retired. I don't use these on my Progressive and it is still pleasantly quick. While I do not have personal experience with other indexer designs, I would like to point out what I believe is a distinguishing feature -- with both positive and negative aspects.
To my understanding, the Moon Unit may be unique in that it indexes on the UP-STROKE of the handle. That allows good control of the speed and abruptness of operation. With other designs I have heard that the abruptness can lead to powder spillage if one is not careful. The flip-side of this design feature is that is diminishes the ease of tool head (caliber) changes, because the bushing that drives the system captures the top surface of the tool head. If you don't plan to change tool heads, it is a great solution.
As I believe others have mentioned, if you use the Case Kicker, be sure to get your custom "short" taper crimp die from Dave Wilson (fc60).