Thanks! My mods are going to be as follows (in order):
* Amperex HP-branded input tube
* Dayton polypropylene caps
* 5998 power tube... unless there's a more realistic sounding alternative for cheaper.... but the tube itself is also so pretty...
* stepped attenuator
That is a sensible order. I am quite satisfied with the stock pot at the moment. Mine seems exceptionally quiet, balanced and smooth turning. I have the Dayton caps but just put in 820 uF Nichicon Electrolytics bypassed with 1 uF polypropolene caps. Bass really kicks while snare snaps nicely.