Taz,
MJB is right, any of Ben Dale's (Edge Pro) kits is superb. The little problem is not all people can afford his systems. I also heard good things about the SKARB, though Joe Talmadge hasn't quite finished reviewing it yet. Do a search on keyword: SKARB, and there's a thread about it not a long time ago. I think I'm going to buy one too soon.
About other systems. I have all the systems you mentioned and here are my findings. Keep your Lansky system handy and buy a DMT Aligner kit with at least two stones (like coarse and fine). You can then use your Lansky clamp (and your Lansky universal mount if you have it) with the DMT stones and guide. The only concern is that the use of a DMT guide+stone with a Lansky clamp will make the angle a little off a bit. In my experience the angle of a DMT stone would be always lower than a Lansky's. This is not a big problem for me, because I always finish my sharpening with a fine or extra fine stone from a Lansky anyway. The effect is like creating a back bevel first and finishing it with a steeper angle. I wish there were an easier way to explain this, but I think you get the picture.
About Sharpmaker, it's my favorite. Sure the most difficult task is to adapt your new folder to it's angle(s). Creating a back bevel for a new folder (with a factory angle) would be a tedious task and is something that you can't avoid with any system. The only difference is how fast you can get there. I got other systems to create back bevels (diamond stones are extremely fast). But for touchups there's nothing out there that can beat Sharpmaker's simplicity yet, at least IMO.
IMHO there's no such thing as 'the right angle for ATS-34.' Of course a tougher steel will take a finer edge. But the angle of a knife also depends a lot in its blade geometry, thickness and the use of a knife (chopping or push-cut). If you want to stick with factory angles, just do the magic marker trick. Experiment a lot, and you'll find the best angle that suits your folder and your needs. Most of the times, my folders (and i) like the angle of a Sharpmaker.
Good luck.
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Reynaert