Best imaging and sounding bookshelf speaker


I have a pair of Spica TC50's (crossover recapped). I'd like to hear your opinions of what you all think is the best imaging and sounding bookshelf speaker. I will always own my Spica's but I also own a pair of Apogee Centaur Majors. I simply haven't found a speaker that images as well and sounds as natural as the TC50's. Thanks in advance for your opinions.

Associated Eq: Van Alstine Super Pas 3imodified by Tom Tutay, Marsh P2000, Rogue 88 Tube power amp, Scott Nixon Tube Dac, Oppo DVD player, Systemdek IV Electroic TT with Rega RB600 and Ortofon Rondo Red and Jolida JP9 modified by Tom Tutay.
ponnie
For imaging, coaxial speakers are hard to beat.

I second the KEF LS50.

And if you can find them on second hand, Thiel MCS-1s tho they are on the large side of "bookshelf". I have always loved Thiels so here are some more - PCS1 and SCS4.
Spendor SA1. These little babies cast a HUGE soundstage, image precisely, and disappear from an audio standpoint. They are quite handsome too.

Every time I have given up small Spendors I have regretted it, so I have been holding on to this treasure since it came out a few years ago.
Surprised nobody has yet mentioned Joseph Audio. I find them to be among the best in terms of imaging and disappearing, and they also strike me as a very natural sounding speaker despite conveying lots of detail -- not an easy or common feat to pull off IME. They also have the benefit of being relatively tube friendly as impedance generally bottoms out at around 6 Ohms.

ATC SCM 11 (2013)

what hi-fi % STAR RATIING

http://www.whathifi.com/review/atc-scm-11-2013

" .... Best standmounter £800-£1500, Awards 2013. ATC has struck gold again. These are the most talented standmounters anywhere near this price...."

" .... Verdict: The new SCM11s are a drastic improvement over an already talented performance, and they have the good looks to match. ATC has raised the bar it set itself. This isn’t just a step up – it’s a running leap ..."
+1 @ doggiehowser. The Soundfield m1 uses the kef coax uniq driver augmented with an 8" powered long throw subwoofer. They are the best imaging speakers I have heard under $5000 and cost a fraction of that.