notice you are from Southampton, why don't you talk nicey nicey to Neil Harvey and get him to take you out on a spin on his Shakespeare 720, boat, very well made boat lovely hull and very well priced from the maker StevetheBoat on this forum.
Ospreys are great boats too . Prosports are iffy
I can't think of any reasons why an old ribtec (pre SA) would be dodgy. The hulls were made by Trio Mouldings and the toobs by Henshaws Wiring might be an issue but if your buying a 4 year old plus boat you should be thinking about a rewire anyway. Avoid the Camel Trophy series.
I'm the most honest person I know and even I would be economic with the truth about fuel consuption so always take that and engine hours wuth a pinch of salt but with your budget you should be able to buy new
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