A T5p with "brain-rattling" bass and sound preferable to the HD800... would be worth looking into, at the very least. The lack of bass quantity is, by far, my biggest issue with the T5p. I'm not particularly handy myself (I could probably find a way to bring about the apocalypse by soldering together paperclips), but maybe one of the other Teslateers around here would be willing to give it a go.
Thanks for the reply, man, and keep us posted with any other thoughts or mods you have!! And I'll try not to think too much about how mind-bendingly awesome it would be to have a T5p with ample bass.... *drool*