A couple brands that I recommend:

Jamo E875 ($2000 CAN)
Jamo E855 ($1300 CAN) - slightly smaller than the E875
Dalhquist QX10AB (support the local boys - made in Missisauga, Ontario)
Wharfedale Diamond 8.1 and up

The bass response from the Jamo's are amazing on their own for the price and the 8" sub to match them is just deadly.