There are a number of very good subs on the market now make sure you take all the costs into account. When I looked into it, the only subs that didn't have a significant shipping/duties premium were those from SVS (they have a Canadian dealer). Keep in mind the savings from the HT discount and outlet stock.
Though this will vary depending on the room, I have recently measured and found that the EP350 reaches down to 22Hz in mine.
If you listen to music with pipe organ or synth in it a lot and/or watch a lot of movies, you may want something that reaches a little lower.
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!