Which components knocked you out on first listen?

Oneobgyn's system(a few years ago); Magnepan speakers with the old Rega Planar 3; Vandersteen speakers with the original Oracle turntable; some old Infinity speakers with a tweeter that looks like the old Ohm Walsh(this one grew on me); Linn Linto with an all Linn front end; Linn Lingo I on Mapleshade's isolation with triplepoints; Oriek's modified Dynaco Stereo 70; Oritek's preamp/dac in comparison to other top-line preamps; Lessloss power cord; Oritek's X-2 interconnect; APL's designer(Alex) home system's high frequencies which was matched by the high frequencies of Nordost's Odin wires and power conditioner; APL's mk111(?) silver interconnect; Klipsch Heresy speakers; Valab's silver interconnect(for price); APL's modified Denon 3910(the first decent digital that I heard. I still use the transport with a Lessloss power cord.); Oritek's battery-powered(one version)pre/dac on cd-the best, by far, cd I've ever heard; NAD 3020 with DCM Time Windows. Given the current state of reproduced music, don't take my early experiences as a buying guide.

Recently, when I switched back in the DNM Reson ICs in place of some others (MIT and Harmonic Tech), they surprisingly knocked me out with their tonal clarity and seeming coherence and have taken over my system since.

Massed strings on Magico mini's with good tube amplification almost floored me couple years back when I heard them.

Also recently, a pair of GOTO custom horns of some high end tube electronics and vinyl rig at Capital Audio Fest knocked out most everyone I encountered who heard them with various classical and jazz pieces played.

My current system setup overall mesmerizes me regularly, particularly with the OHMs, but it took a good bit of tweaking and refinement to get it there. If I allowed it to knock me out, I'd be dead and buried by now.

Klipsch LaScalla
McIntosh C32
McIntosh 6200
Krell 300
Wilson Watt 2
Wilson WAMM
Thiel CS 3.5
Thiel CS 3.7

JL F100
JL
F112
JL F213
JL F113
B & W 802D

EgglestonWorks Fontaine speakers - my first, and still current, main speakers. I had auditioned several speakers for my first venture into high end audio. Up until then the speakers (all far cheaper, retail-wise) I heard were nice, and obviously better than my current low enders, but none knocked me out. When I auditioned the Fontaines they knocked me out cold. At that moment I knew I had to have them and begin a pursuit of high end sound.

My wife was pissed at me when I got home with them for blowing my budget, but after setting them up and selecting the "Miss Sarajevo" track on the Passengers CD, she was equally floored and thus quickly forgave me. These speakers really are special.