"Used"Revel F-30 or AP's Virgo II: Better Value?

Want opinions on what is the better value in used speakers.Audio Physic's Virgo II's or Revel 30's. The Virgo's when "current" were about $4495; Revel F-30's are $3500 at retail. Both can be had on the "used" market for between $2200-$2700. Need opinions about "overall"(especially, bass response, imaging) performance and "potential" of both speakers. By "potential", I mean ability to keep sounding better with reasonable upgrades. Thank you, SJ