Are you planning on selling your 660 anytime in the future? I'm trying to get an Oade mod 660 into Canada without paying ridiculous duties in the next month or two..
Also congrats on the Mac switch, I just bought my second (upgraded from a PowerPC to an Intel MacMini)
You won't regret it, I lost all my photos on my old PCs 3 times before I said fk it and bought a Mac..OSX is a much easier on the head than Windows.