Hmm you see the thing is your proposed use is very similar to ours as far as I can see.
Days out/holiday... two folks with dog optional... not wanting to trailer the boat set up... avoid trailer launch giving greater launch flexibility... probably want decent comfortable (within reason) ability in a sea.
And after 7 previous SIBs which part met those needs we have settled to the Aerotec that fully meets all such needs. It's a niche SIB but if that's your niche too they're a very good choice.
So how about this...
https://www.ebay.co.uk/itm/Bombard-A...IAAOSwAz1c~P4~
Yes it's more expensive than most on the used market but it's a 2013 which was before Zodiac started getting in a complete muddle but still new enough to push potential glue issues way in the future.
It come with all the kit inc the excellent OE HD Zodiac wheels and a 12v pump etc. The Suzuki 20 efi is a very popular 4-stroke and perfect match being the modern lighter design at 44kg.
I reckon... not that you can buy a new Aerotec now except for a slim possibility of special order... at new prices that's around £5250 worth of kit and a guestimate of split used values would be £3250 so trim just a bit off and it's about the right ball park.
If you really fancied a new Yamaha 15 2-st that Suzuki could be sold off still leaving the SIB and bits at right money.
I speak from experience (of weight not model) on a daily setup or holiday use dragging up a beach or on slightly more awkward launches you'd appreciate the 64lb weight saving over even an air floor Futura.
Having said that you've mentioned them as if interested so if you have a fancy for a new Futura no point in messing about listening to what others think you should just get one.