Have you checked out:

Robert Natus - usually kicks my arse into the middle of the next decade!

Chris Liberator (also check out Cluster Records)

Andreas Kramer

K D Smith

Woody McBride (some are hard, some not quite so hard - but usually top quality)

Advent - Cisco Ferria (I can never spell his surname!?)

I can't think of anymore off the top of my head, if I do I'll let you know...

Enjoy

MM :)