The first five Magnum albums are killer and twelth Night pipped Marillion to the post with their genesis like sound. Pure Reason Revolution have a very small discography but I feel that they should scrape into the 100. I have heard one album each by Spocks Beard and Coheed & Cambria and I thought they were atrocious but that's just my opinion. Spookily I'm listening to Mahavishnu Orchestra and was before I was on this thread
A few more bands (prog metal) with a few albums to their name and decent ones too:
Sieges Even
Lake Of Tears
Tomorrow's Eve
I recommend them all.