The only advantage to the MkII (and I have both) is the geek factor. For $50, I would gladly pay to go from 12MB to 16MB, so I strongly urge you to get the Mk2a. You already have a load of tracks, and if you get more, the extra ram will come in handy... Paul G. and I are already running into issues w. our Mk2as because of limited RAM.