Hi - I'd add a Highfield to the mix, absolutely love mine and she runs great with the four on as we're a 2 + 2 too
I run a 6m Patrol, trailer based and can easily trail and launch. A 660 would be great for the Solent, but I do know each time I've had mine up there she's performed great.
I'd probably go newer shape Sport by choice now as I like the seat layout, its the same hull so no real difference in ride, just looks
I do find when out with other rhibs, she gives a great dry ride when compared to other makes, which is key to a good day out, especially in the Solent .