Wow cool thread resurrection!
This is a good resource, so I will add my own experiences.
T-Amp : Ehhh, it was ok. Detailed, but sounded very shrill at times, and very thin. Good cheap solution if you are willing to risk damaging your K1000s (some people will tell you there is a risk of killing the K1000 drivers with prolonged T-Amp use). I'm not sure if I believe it one way or the other, but just to be on the safe side, I moved on to:
Singlepower PPX3 SLAM : This amp did a very admirable job of driving the K1000s, but I wouldn't say it drove them with the authority I was craving. I had to turn the SLAM voulme up a bit past the 1 o'clock position in order to drive them decently (any other headphone at this volume would make your ears and your head implode). They sounded nice and detailed, and a lot 'fuller' and warmer than the T-amp did. This amp was a much better solution than the T-Amp. In the end, I decided I could do better for the K1000s, so I did some research and moved on to:
Pass Labs Aleph 3 : This is where I realized just what the K1000s are capable of doing. Since I am not confident I can do much better that the Aleph 3, I am calling this the
amp. for me and my K1000s. The Alpeh 3 makes the K1000s sound right (and the way I always imagined they should
sound). Of corse the down side is you need a pre-amp since the Aleph 3 is just a power amp. Also the Aleph 3 gets very hot so it needs good ventilation (small nit-pick).
IMO (and also according to AKG) a power amp with at least 30 watts per channel with the K1000 spade connectors hooked directly to the speaker lugs of the power amp is what is required in order to drive the K1000s to their fullest potential.
So in the end, I discovered that AKG actually know what they are talking about! Who woulda' guessed it?