Edit: Whoops, wrong series for the Jamo . . . supposed to be S426, not 506. I was looking at the 506's on Jamo's website.
I'm in the process of upgrading my HTIB to a low-mid range setup. I have the idea to keep it at 5.1 for now, and move up to 7.1 later.
Costco.ca has two sets for a good price, and they both seem like good deals. I've read positive things about both:
KEF C1 5.1 Speaker set, $499 CAD
Jamo S426 5.0 set, $399 CAD