Seeking subwoofer recommendation


I am looking for advice on a subwoofer to pair with Vandersteen 2CE speakers and a Rogue Cronus Magnum II integrated amp. It is my first foray into sub-ville, and I want a decent sub (new or used) for less than $500. I know there aren't stellar performers at this price-point - I just want to dip my toes in the water and see how the sub sound contributes to my system. Feel free to recommend subs up to $1000 if they are a much more worthy performer. I want something that will integrate well. Thanks in advance for any recommendations.
Room size is 18'x15' with brick walls, wood beam ceiling and fully rugged.
arturos73
+1 SVS, no actually +2; get a pair of them!!! SB2000s are what I am using. They are VERY quick and dynamic and sound amazing. 
Not unless his integrated has preouts and amp ins. That's the only way 2W series subs can be used  with integrated amps.  
+3 for SVS.  
Using a pair of SB1000s.  
Continuously adjustable phase as well as gain and crossover.
Accepts low or high level input.
Were easy to integrate.  
Apart from the LED, you can't tell they are running (until switched off).
I liked the smaller footprint and lower price of the SB1000 but the SB2000 is a great value too.
45 day money back in home trial with (as Mental noted) return shipping covered if you don't like 'em.