I agree with Rocky that the new 360s are much more reliable and that the Futureshop extended warranty is not worth the extra 100 or so dollars.
If for some reason you're in Winnipeg, check out the radio ads on 92 Citi FM on Saturday morning. Today, there was a computer store downtown selling off Premium 360 bundles with an extra controller and Halo 3 for $250.
Otherwise, Futureshop seems to have the best deal right now. Especially if you manage to find a Premium for $199, or they run out of the two free games (DOA and Gears) and offer you a free $60 replacement!