B&W are good from the CM series and up. Did you try the mirage's at Bracks?
None of the local retailer in Toronto would know SVS and HSU.
There's nothing under $800 that wil get the ummmphh of a SVS or HSU. My Mirage Bi-Polar BP150 2 x 8" gets pretty low. Buts it is $1000cdn.
Audio Excellence Yorkville I believe has Rel subs...They go as low as HSU I believe but they arent cheap.