There was a post on the old Honda Karma / H-Tune forums about this. Unfortunately those forums are no longer online but from memory the overall comment was that it's a good buy just a few things to watch out for:
corrosion by the rear wheel arches
rear brakes binding
there may have been one other thing that escapes me. It may have only been relevant to a certain subset like the diesel or automatic versions
My own comments:
power steering can start whining. Usually replacing the o-rings and fluid does the trick, if so this is a cheap repair
(petrol, manual) if it hasn't had a replacement clutch, chances are it will need one around 80,000-120,000 miles.
They tend to hold their value relatively well
(petrol model) check if it has an OEM catalytic converter. If so this is a target so ensure it's protected and/or marked. Some local police forces are doing this for free, either at a 'drop in' session or through the Honda dealers - in my area both have been offered. If it's a non-original replacement, it's less likely to be targeted as it's not worth very much to the thieves
Hope this helps, good luck with it