If you keep your current nani 1/3k surface of the stone refreshed it should do a fine job at setting a bevel. I have Hart steel and PRC razors which are pretty darn hard and I once thought the Nani ss 1k couldn't do the job but I later found out all I had to do was re fresh the surface with five or so figure eights and the stone is cutting again!

On the other hand. I currently own the Chosera 1k, the Shapton pro 1k, Shapton pro 2k and Shapton Glass 1k all splash and go.

If I had to pick one that isn't the Chosera 1k for budget sake I would say go with the Shapton 2k (or 1.5k? which I have not tried but hear it is similar in feel and power to the 2k Shapton pro), also it is very very similar to the Chosera in that I have found it cuts as fast, as long, easy to lap or refresh and the scratches are shallow like the Chosera 1k.

My second choice would be the Shapton Glass 1k, fast cutter but the only negative I found is the cutting surface needs to be refreshed often.

Third would be the Shapton 1k, it does cut fast though I find it's surface doesn't cut for long needs constant refreshing and the feel is not to my liking. It will work though, even better if you build a slurry.