@4khris: I've never tried the W1000 with that tube amp, but I know it has synergy with tube amps. The more powerful the tube amp, the better obviously. Without a tube amp, I would describe it as sounding like an AKG K701 with slightly more mids and less treble. If you buy the W1000, I would recommend you use an equalizer to bring up the midbass signal a little to balance out the sound of the headphones.
If you like tubes and would like to venture further into tube amps, then I highly recommend the W1000 because I know they will keep continuing to improve. I honestly have not heard a better combination with my Woo Audio 6SE and W1000. Very natural upfront vocals, huge soundstage (everything is very very well separated), very high clarity in all the areas of the music. Some may find the low end to be lacking, but spending a few days with it will help you grow accustomed to the low end. It is definitely stronger than the low end in the AKG K701s. Extremely relaxing sound.