I auditioned the HSU's and found the VTF-2 was very good for the price. It hit the lows with authority during Terminator 3 (the chase scene turned near reference level) The VTF-2 went lower and smoother then my Velodyne. It also was very smooth and blended nicely on music. Demoed some DVD-A and SACD's, although I should mention the system as a whole was very impressive with the new Energy Ref. Cons. All in all , best bang for the buck subwoofer I've heard.
That being said for your room size, if you listen at or near reference levels, I would suggest the the larger more powerful VTF-3.
May I ask what dealer you saw these at? It's nice to have other options.