Today's progress:
I recieved the Blackgates, and proceeded to first install the N's in place of the standard coupling caps. I used 47uF instead of the stock 200uF, since that would have been very expensive, there is still no DC on the output, even with the loudest possible signal and in high gain mode. Instant improvement, even w/o burn-in, the sound felt as if a veil had been lifted, it was much more direct and tangible than before.
Next, I put in the FK's for the caps around the voltage regulators and clock crystal. I used 100uF instead of the stock 47uF. Wow! The speed and precision of the sound was improved greatly. The cymbals and drums now sound at least as good as my E-MU (haven't had time to compare a lot yet) and possibly even better. Cymbals went from "chsssssss, chsssss" to "chsst!, chsst!", and drums changed from thumps to solid thwacks (using the intro of the Dream Theater song "6:00" which Edwood is very familiar with, thanks to me).
I did not change out the caps on the middle lower area of the card, as they are all used for the ADC section. Also I put all the new caps lying down on the back. The stick up maybe 1cm from the back, so there is room for all but the thickest PCI cards in the slot above (my TV tuner card's shield is too thick). So this will be a 1-slot card, even with the mods.
Considering the improvements of only the blackgates, I can't wait to see what the opamps and polypropylenes will do. Hopefully they should be here tomorrow or the next day.