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h0ughy, if you're looking for a guidescope you don't want it being too much shorter in the FL than the mak. Maybe something that is about a half to a third the Fl so you can use a 2X or 3X barlow to bring it in comparison.
I asked in a post a long time ago what the shortest fl you could use for my old lx200. Theorectically with sub-pixel guiding I could have gotten down to a 300mm fl scope. Realistically though taking indeterminate seeing into account, at least half the fl would make life a lot easier for you when autoguiding.
HTH
CS
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