Some do come to mind...
Apart from the one's you've mentioned I really like Tony Conrad, especially the collaboration with Faust. I'm sure you know it.
La Monte Young is one of the big names of the genre, but his foray into blues seems to be less known. I really like it.
Michael Nyman has some great music, me being a huge fan of Greenaway's films might be a factor though.
The Necks' "Drive-By" is pretty much easy listening, but it's a great hypnotic album to relax to.
A lot of Evan Parker's solo sax albums are very minimalist and repetitive and should satisfy fans of minimalism without aversion to some nice screeching.
And apropos minimalist solo sax: Colin Stetson
