If you go synthetic, a 12k Naniwia or the 8k Naniwia Snow White are the way to go. They are both finishers and way more aggressive than folks think. The Snow White will finish as well or better than the 12k and is splash and go.
Finish with Chrome Oxide, paste a piece of cardboard if you do not have a dedicated strop, to ease into honing. Get some good magnification and you will be set for a while. 60-100x Carson Microbrite, $10-15.
Here is a post on just how aggressive a 12k super stone can be. (
12K Super Stone Chip Removal/Bevel Set).