Welcome to the forum.
Add your budget please and confirm if you're looking for 6 seats as that changes things quite considerably in terms of RIB size. If you're looking to pull a ringo or water toys, you're probably looking at engine anywhere from 80hp up.
You're always going to get a mixed response when it comes to brands, as understandably people know what they know.
Ribeye A600 is a nice looking boat as it has dual jockey set-up and recessed rear bench-seat for three and powered with 100hp. Second hand, even for 2010 model you're still looking at £25k. The new models come with 150hp and have dual double jockeys but to be honest the second seat behind the cox and navigator looks tight as gnat's chuff. There's a console seat up front, but that's just for cruising at low speed in flat calm or at anchor, and I wouldn't use it for kids.