Ok, well here I go showing you all what a low IQ I have...
Celestion DL10 - 1st speaker to show me what I was missing from consumer stereo crap.
Kef C40 - Purchased soon after hearing the DL10's - my first love, though maybe not as lovely as the DL-10s.
Yamaha NS10m - a staple in my business (recording), and great for obtaining mixes that translate well the speaker world over, but quite boxy and mid-fi sounding.
D.A.S. Monitor 8 - Some phenomenal voicing - great for cellos and a lot of other instruments, beating many other speakers, but a confused upper bass and not much depth.
Celestion DL4 - eh
Krix Equinox - Imaging, depth, quickness - a fun, fun bookshelf - will probably never sell.
Rogers Studio 1a - the first speaker to ever make my jaw drop to the floor. Taught me what "holographic imaging" meant. Some flaws with cabinet resonances and perfect bass definition, but a very special speaker with that Rogers magic.
Quad 12L - Doesn't have the weight and authority of the Rogers, but still has weight, and great imaging and depth. A wonderful speaker in it's class and price range. Compared to Krix, I would give the nod to the Quads for classical music and to the Krix for rock. The Quads are a tad more polite, the Krix a bit more forward.
Quad ESL989 - I'm sorry, I just don't get it. Though I heard a lot of great things in them at a dealer's showroom, there just wasn't enough detail or quickness or forwardness for me. Maybe I'm just not an electrostatic kinda guy, maybe they weren't set up well...
ATC SCM20SL - My current love, though I still own most of the previous listed speakers. Best defined bass of the lot, best midrange. Great imaging, great voicing (though the D.A.S. still has it beat on cello, and possibly the Rogers too). The SCM20's are great at defining instruments, their timbre, their placement, and overall tonal/harmonic balance. But they are not the master of depth or holographic imaging, though they hint at it. However, they are at present the best speaker I have heard. What they do well overcomes what they do not do perfectly.
All of these speakers have taught me what is possible, and I can pretty well extrapolate from them what can be achieved on the hi-hi end, like some of the previously mentioned speakers in the other posts. Like any self-respecting audio-phool, I of course have a healthy case of lust for most of them, and plan on working my way up the food chain and owning or auditioning most of them over the next bunch of years.
Thanks again all for your posts, please keep 'em coming.