Brodie ......Seariders are good boats, the hull is pretty simply made from a fixing things perspective, to gauge the value we need to know more details like the condition of the tubes, hull, seats etc and list what kits going to be included with the sale.
JK's right (again) offer him a stupid amount and see what he says, he may not know what its worth
and agree to a silly amount.
If you want to know what to look out for when going to look at a 14 year old boat just ask..... i and others here have bought old and renervated and learnt the lessons
at cost !!