Ditto on the RIB, unless you need to be able to break it down to store on the boat, an RIB is the only way to go, and at least a 310, anything smaller is a toy. An 11' RIB is expensive, but trust me, even after ten years, it'll still put a big smile on your face.
Get at lease an 8HP, don't worry about the weight as you should be using a lifting strap and a halyard for lifting anything out of the dink, anyway. Goes right up and on the stern rail.
A 11' RIB with some HP makes coming and going from the boat, even with six people, a pleasure.
Certified...in several regards...