I am trying to decide between the 3 subs. The HSU VTF2 MKII may be my third choice because of power. I know on this forum SVS seems to be the sub of choice. Will I go wrong on either the VTF-3 MKII or the SVS PB1-ISD? I haven't heard any of them so it is by the reviews only. The new HSU VTF-3 has a new 350 watt amp vs. 320 on the SVS. Will the HSU go a little lower? my room size is 15 x 21 x 7.5 with an open balconey and open stairway at one end. Thanks.