I own the Thiels and have never heard the other two in question but would add one comment blind. I love my Thiels but had to pay more then their price to get an amp to make them sound good (wonderful -Krell KSA-200s) So you might get better sound from the other two speakers if you don't plan on putting down over $2500 for a good used high current amp.
Thiel 3.6 vs. Spendor SP100 vs. PSB GOLD
Many of you praise the 3.6s (although w/equipment caveats). Has anyone compared them to the SPENDORS (praised, but criticized for so-so imaging & loose bass), or the PSB Stratus Gold (another liked & hated speaker), & even to the Vandersteens? Could you characterize the strengths & weaknesses of these speakers?