I think Roman Hamrlik should be in the discussion here. He gave the Habs four solid (and underrated seasons), playing pretty much #2 minutes the entire time while replacing Sheldon Souray. He averaged nearly 30 points per season (the Habs made the postseason each year), blocked an absolute ton of shots (731 in 312 games), and provided a lot of stability on the back end. He was never flashy but he was a key, core player in his tenure with Montreal.