I know a customer that has a nice 2004 13' Caribe with I believe a 50 hp Honda, located in Pompano Beach, if you're interested PM me and I'll get you the owners contact info.
personally I d put other factors before a stereo or bimini which can be added easily. Way too many RIBs in that size range don't have enough seats... I never understand how you d have a RIB that can seat 4 on boat that can sleep 6 or in which you often have 6 to 8 friends during the day
That's always a problem on yachts smaller than 75' You just cannot fit the amount of people the boat can sleep on the size rib or tender you have room to fit on deck.
We have a 14 rendova on the 70 footer i run it has 3 double bench for 6 and will plane on the 50 yam as long as the pax aren't too heavy We have had as many as 10 people on it at slow speed with the extra 4 seating on the tube. Nice design.
As you said, the larger the boat gets, the more people it will sleep so even the larger tender won't take them all. Our largest tender carries up to 9 passengers. But on our largest boat which it is on, we have two tenders with the other one rated for 7.