I just sent my 3i in for a repair and asked about upgrades. Joman is correct; the only upgrade available is the 6 pack capacitor upgrade with is $600.00!!! So I passed.
One upgrade is changing the capacitors and going with the "Six pack." I would suggest calling BAT and talking with the folks there. Tell them what you would like to accomplish and they will offer suggestions. I have found them to be very accomodating.
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