Welcome to head-fi. It is customary to add "sorry for your wallet"!
I'm not familiar with the Yulong. However, I can comment on the Meier Concerto and Classic amps with LCD2. Most recently I have used them with Eastern Electric, Meier and Schiit (Bifrost) DACs.
I rate both amps as very good. However, they sound quite different to my ears.
The Concerto has great 'attack' or 'speed', most easily noticed with sudden, sharp, loud sounds. Examples are the forceful, fast strum of a guitar or plucking a string. They come over with sharp, clearly defined edges. Against this, the Concerto is 'dry'. Notes decay more quickly than I think is natural. Harmonics, resonance and reverberation similarly decay fast. On the plus side this gives the Concerto considerable clarity. Changing instrumental textures separate well. It's an analytical and detailed, yet still musical amp with the LCD2.
The Classic has softer attack and natural decay. Notes 'hang' (fade gradually and normally) as they should. Bass seems more present, yet still balanced, lending instruments more 'body' than the Concerto. Soundstage - not something I normally notice with headphones - is very good, well extended in width and somewhat so in depth, with well-focused images (you can sense the 'location' and space of each instrument and its space well).
As you have heard the Classic, this may give you some idea of the Concerto's sound - although I must warn you your ears and brain may hear quite differently from mine. If you don't relate to my description of the Classic, it would be wise to ignore my comments about Concerto!!
Btw, the Classic is more apparently powerful than its 3dB or so power advantage over the Concerto suggests. This is, or may be, because of higher gain and differences in Jan Meier's implementation of his ingenious volume control.
Finally, whether these or any other amp will "substantially enhance what [you are] hearing now" depends how your listening and tastes develop. Equipment changes what we like (we tend to favor tracks that sound better with our equipment, for example!); and to some degree what we eventually come to miss.
All this is for you to find out for yourself, generally an interesting and rewarding experience.
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Now that you know the background, here are my questions:
2) If the D100 plus Corda Classic idea is OK to go ahead with - then what about getting the Corda Concerto? From the specs both looks the same with the Classic having marginally more power. The reason to ask this question is obviously because the Concerto (500USD) is now cheaper than its successor Classic (800USD). Anybody has any input on the performance of the Concerto compared to the Classic?
I want the sound signature of the LCD2 to remain unchanged.
Any help will be highly appreciated