Yes the Zalman is one of the best air coolers for VGA. It's tough finding Silencers here in Canada also - I had to order mine from BC (NCIX); otherwise I would've just driven over to Canada Computers

.
I'm a big fan of using Arctic Silver 5- it cools better than the stock stuff and one tube lasts awhile, and multiple CPU/GPU applications.
If you're in Mississauga, there's a place called Liata Computers just south of Canada Computers (south of Mavis and Burnhamthorpe) that will sell you Arctic Silver 5 for 7.5, and probably give you a slightly better deal on the Zalman GPU cooler as well if you haggle politely with them

. Best of luck!