I'm not fond of this list. Try 1kingwest, Cosmopolitan hotel, Pantages hotel, King Edward, Le Germain on Mercer or Cambridge suites. If you going to go budget try a smaller place like Hotel Ocho or Beverly Hotel over the Sheraton Centre and Eaton Chelsea which are too busy.
The Westin Harbour is too close to the construction area on Queens Quay so steer clear. It is bit off the beaten path.
There are buses from the airport that take you to downtown core for about $25. Option B is the TTC Toronto transit bus that takes you to the subway which will take you downtown for $3 if you really want to pinch pennies. Otherwise a cab will be about $50.