Last winter i was looking for a similar boat for my local sailing Club, we had a very old Avon SR4 and due to excessive cost of a new one was quoted around 7k we bought a 4m Humber assault around 4k, as a small boat it is fine but the SR4 is leagues above. We still have 1 SR4 left and im going to plead with the committee to let me retube it rather than buy a different 4m.
For 9k you wont be able to buy a new SR4, engine and trailer, unless you find a much better deal than we did. I think you would be talking around 11k for a SR4, new 40hp and trailer. Im sure there are deals out there and hope you find one.