Subwoofer Recommendations for Audiophile Monitors

Do any of my fellow Audiogon members have any subwoofer recommendations that might play well with Harbeth 7ES-2 speakers? I love these speakers. With my ARC VSi55, these speakers make beautiful music… unless I chose something like the Bach Cello Concertos or Beethoven’s 3rd. In these cases, it seems like a different piece of music. The fact is, with most of the sub-60 Hz missing, it simply does not sound “good enough”. Yes, I am spoiled. Most of the time I am enjoying my Coincident Total Victory speakers. There is nothing lacking here that I particularly miss. It just seems that these nice speakers need some help. To that end, I have tried several solutions. I tried my home-theater system’s Klipsch RW-8 with the Harbeth. That sound was simply NASTY! This sub does fantastic auto crashes and star cruiser impulse power, but terrible Bach. My dealer was kind enough to lone me a REL Studio III (the only sub he carries, aside from the Klipsch). I must admit, it did sound quite nice. The problem here is that it is large enough to be mistaken for a steamer trunk. Just out of proportion with the rest of this office-size system.

The other subs that have been recommended to me are the Spendor SUB-3, Epos ELS-SUB, and the Monitor Radius 360. The problem is that none of these are available for audition to someone living in the center of the Pennsylvania forests. Has anyone had any first-hand experience with any of these subs?

Thanks in Advance,
Lance