As you are aware we have the 805 as well. We have had it for 5 years now and when anyone outside the clubs asks me what type of boat I have, I liken it to a caravan on water. We are a family of three and I must admit we only just all enjoy the space. I am not sure how we would get on if we were a family of 4. However, as your kids get older and discover technology, they will be more in the cabin than out!!
I can fish with 3 anglers out the back quite comfortably, or two anglers with 4 rods.
We have also had special made cushions which fit the top deck (they cost £600.00 to have made) this gives us an extra 48 sq, feet of sun bathing space. However, that is fine if you are around the Islands not out in the bay which could be uncomfortable due to the pendulum effect!!
We too have looked high and low for another vessel, but they do not exist unless you are willing to pay £90k plus. Charlie did the right thing by creating Alfresco. His boat fits all the family and fishing needs but you will need a big wallet and time to go down that route.
The 805 is very economical on fuel and I use it a lot as a winter fishing boat as it has a great cabin to get out of the cold as well as the inboard heater.
I think it also come down to the fact that you need to determine whether you actually need an out and out fishing boat or a family boat.
And good luck with that one!!!!!!!!!