...used to be the best until theyh switched from U.S. Prime to Canadian beef. On my last trip I dropped 3 bills for the wife and I, and left pissed as hell...the waiter even acknowledged that since they had made the switch people were complaining (he was the one who culed me in that the switch had been made...all I asked was "WTF"). Given the now (relatively) poor quality and the OUTRAGEOUS drink prics...I haven't been back.
Morton's used to be my most consistent favorite - I've been to Morton's all over the world, and typically they very consistently deliver, and for less than Harbor Sixty (Dinner for two @ Mortons is typically $225 - $250). Alas, on my last couple trips there I've again been like "WTF"...and again the waiter reported that a switch had been made from U.S. Prime to Canadian beef.
I've been to Ruth Chris in Mississauga, not bad. I've been to Barbarian's in the city...pretty good. And I agree with others that Le Biftique is a pretty good value, though can be inconsistent. But at this point, with both Harbor Sixty and Morton's leaving something to be desired (at least at those price points), I don't know if I can recommend ANYPLACE in the city for (world class) steak. What I do now is just wait until I am back in the U.S....