I had a E93 BMW before this car but i had to change due to having a baby on the way and like you i fancied getting back into something fun aswell. I ended buying a blob STI. Plenty of room in the back for the ISOFix base and car seat leaving the passenger plenty of space. The boot is surprisingly big aswell. I had in there the other day a cosatto push chair base along with the moses basket, 6 x 10ft football nets bag, footballs and a scooter.
So a scooby is a capable family car. I have a 11year old and a 5 week old.
We have a Focus as are first car though. No way i would do long distance family day outs in the scoob. Makes too much racket and isnt that comfy on long journeys. My mrs hates it. I love it but mainly as a toy.
So basically an awesome toy that is capable of sticking the family in there if need be but i will use the Focus most of the time for the family stuff. I tend to just use the scooby for thrashing about when i fancy a drive on my tod. Just see it as my big toy lol.