Travel Insurance To Canada?

Hi everyone. I'm planning to visit Vancouver, BC in August and I'm really concerned about travel insurance (health is the priority). I'm gonna stay there for 5 nights, and I will be entering from the USA (i live in the USA). Does anybody have any suggestions about which company to use to buy the insurance? I would prefer US-based companies. I found one with good rates, but their website looks really unprofessional, so i'm afraid that they are just scammers. If you had experience with any of these companies - i will be happy to read about it.
Thanks.
Thanks.