If the goal is a site seeing bow rider, forget Donzi. The best all around hull for this is an Ultra 23XS. The actual length tip to transom is 21'10" and it is the smallest hull out there to offer "mid cabin" jump seats, enclosed and out of the elements. It has the open bow, or closed if you prefer, and depending on your need to carry a lot of stuff, you can convert from I/O and use the engine bay as a massive storage closet under the sun pad.
So you get a 65mph boat that has seating for 11 and you can pull with a Subaru if needed.
Here are two pics..........
1972 16 OB - C16B-63 - "Surface Tension" Resto Project
1974 16 OB - DMR16106017-B - "The Mule"