hi Matt, theres a 90 yam in grey with newer decals on it! Boats and outboards at £1995.
see link http://www.boatsandoutboards.co.uk/view/PPM030/
I spent some time looking for mine, i guess it depends on the engine hours and if it came with smart gauges but £1995 from a dealer is reasonable.
I had a 50 yam on my 4m searider, great engine once serviced and tuned right goes forever!! start's easily. Can be tempermental on trim, had intermitant probs with 50hp now ive had to change solenoid on 90hp, however 90hp is a 96 yr and 50hp was a 86 yr.
Good luck might see you out there on my new searider (when its done)
p.s i have a spare smart gauge if you end up needing one