Best Integrated Amp You Ever Heard?

I just think an amp has to reveal (...) presence, fast attack and decay, tempo and dynamics

Much of what you seek requires good upper bass & hi freq reproduction in phase. So, spkrs are (a big) part of the equation too.

Speakign of amps, one brand that seems to offer this consistently with various spkrs (including Triangle -- but I only listened to the "Magellan" line) is Symphonic Line. They offer a number of integrateds in their product line.
There are certainly others

Funds permitting, I'm putting my vote in for the Cary 300SEI. I purchased one two years ago with thoughts of simply carrying me over for a couple of months through a system change over. When the time came, I was never able to bring myself to part with it based upon the sheer pleasure it provides.

Some tube rolling and wiring/cap upgrades at Cary, and you've got yourself worldclass musicality for comparitively little cost. Even the power limitation (15Wx2) has posed surprisingly little problem.

The 300 SEIs have been popping up with some frequency over the last several months in the $1800 to $2400 range.

Can't beat it, IMO, and it sure is nice dumping amp stands, shelves, tweaks, cables, etc., etc., etc....

Good Luck.

revox 251.....just purchased the second one...great phono stage, lots of power, absolutely neutral character.

with the right speakers it is pure magic

I like both the Qinpu A-1.0 and the A-8000 (beautiful amp but unfortunately no remote volume). I've had several integrated amps over the years and these are among the best sounding units I have run across.