Originally Posted by CaptainGb
Well, the one rib I find interesting is the ribcraft 850 cruiser. To be based in the Falmouth area and used for local fun days out and longer ones to the scillies.
Why have you narrowed your choice down to that boat? Do you really need 8.5m for what you suggest? especially if you are only using it 50 hrs a year which suggests "nice weather" rather than must go out every week regardless.
On the 2009 IoM trip (which didn't go because of the weather) I had the pleasure to be a passenger on a 7.8m Ribcraft with single 250 HP (Yam) - in some rather lively conditions. The boat was more than capable (hardy soles with smaller boats ventured out too and survived). I'm quite sure the boat would have made it to the IoM too with the very capable Mr Kennet at the helm - but it wouldn't have been fun - but even an extra 70cm wouldn't have sorted that.
I wouldn't have said it was undepowered either - unless you have a hidden desire to get into racing - it was still getting air borne.
Mollers cruises in the sort of area you are in and likes his trips to the Sillies - which he seems to manage in an Osprey about 2m shorter than you are looking at.
So unless you've got money burning a hole in your pocket, a desire to pay more for fuel, pay more to store it, a bigger status symbol, or a massive family etc... then I'd suggest you try some of the shorter boats - you might be pleasantly surprised.
EDIT: Oh, and I'm not sure I'd be wanting to beach an 8.5m, £60000+ rib regularly either