Hang on, am I reading this correctly??
The OP has a Valiant 520 which is rated to 100hp. A good deal has offered itself to him on a DF80. Presumably as the hull is rated at 100hp, the DF80 is gonna be well under its max weight rating. Correct??
If so, why are you lot bleating on about weight and telling him to go pay through the nose for a Yam 70???
It sounds like a good plan to me, or am I missing something here?