I say this as no more than a "heads up" for the inevitable discussions to follow: If you search here, you'll find a very polarised opinion on the Avon, The old phrase "one man's meat is another man's poison" is very pertinant to the Adventure.
The main moan about them seems to be lack of a Deep V (Humber Assault "suffers" the same problem), however if your idea of fun is to cruise to a beach & go ashore for a BBQ, a shallow V is going to be a h*ll of a lot more use. (I actually prefer the Dory for that sort of thing!)
I'm sure if you wait long enough one of the owners might be up for letting you have a ride, giving you the ultimate decider - your choice based on 1st hand experience!
And welcome to Ribnet!