Late to the party but figured I'd chime in for anyone still looking..
Don't forget that you'll get charged tax based on the converted Canadian price as well.
$800 VMR wheels will become $1000 CAD (+/-) and you'll get charged tax on the $1000.
And yes, it's pretty much dependent on the agent you get. VMR wheels aren't made in the US so according to the book, you'd pay tax + 6% duties.
I'd say as long as it shows that the origin address is in the US and it doesn't say that the wheels are made overseas on the invoice, it's safe to say you'll just pay the taxes.
Alternatively, if you spend 48 hours in the US, you can bring across $800 worth of goods tax free!