Aside from those already mentioned, I've looked through my library, so in alphabetical order no less;
Autechre (listen to this as loud as you can)
Biosphere
Bogdan Raczynski
Christ
Einóma
Fennesz
Four tet
Michael Santos
Michaela Melian
Ø (also known as Mika Vainio)
Ochre
Pole
Reporter (from Dundee)
Susumu Yokota
Traject
From your list at the top, I would recomend Susumu Yokota, and Fennesz as good staring points.
I'm afraid I'm too lazy to find all the myspace adresses for most of these lot, but if you go to
www.myspace.com/myvatn, you'll find most of them are my friends.