Re: emg hardware
You can definitely mix them. Check out the EMG website for the proper schematics. You will, however, need to find room to put a 9V battery in your guitar. Also, though they do use 25K pots, you do not necesarily need to get them from EMG. Their pots are smaller than regular pots, which I don't necessarily like. I ordered full-sized replacements for mine from Stew-Mac.
I love the EMG's for really defined sound with distortion, but I think that they're fairly useless for clean sounds (The 81 and 85, that is) Their David Gilmour pups are pretty cool for a strat...
Paul