One thing I forgot to mention is that Dr Diff does offer the front brake kit with small bolt pattern rotors. That would allow you to start the conversion without changing everything to big bolt pattern up front, then just replace the rotors to BBP rotors when you do the rear.
I thought about doing it that way to break up some of the costs. Only problem I saw was that the disc brake conversion pushes the front wheels out 3/4" per side. With my backspacing on my current wheel, I would be getting pretty close to the wheel well lip. I don't know what the backspacing is on my current rallye wheels (haven't had a chance to measure), but it looks like it would be close. Cass recommends a 4.25 - 4.5" backspacing with the conversion.
