Yepp, you have started on the right end, those that you mentioned are really,really good... and if you end up liking the more older stuff, you will have a truckload of awesomeness waiting ya...they are more of an "progressive" type of music though...
Try listening songs like "radioactive toy" from album On the Sunday of Life,
or The Sky Moves Sideways Phases 1,2 , on the album The Sky moves sideways,
and one more "Russia on ice", dont remember the album...
you can prolly listen many of those from youtube...