Well with Italo prog you have the big ones like Premiata Forneria Marconi, Banco Del Mutuo Soccorso, Le Orme and Goblin. And then you have the likes of Osanna, Area, Biglietto per l'Inferno, Quella Vecchia Locanda, and the forementioned Il Rovescio Della Medaglia, and fuck knows what more gems.
Doom - Police Bastard
Still some of the nastiest Crust ever. Gotta love Doom.