Welcome to the Rib world. Others will be along to tell you which boats are better than others from their own experience. I try not to put an opinion over either way as a seller it could be taken the wrong way!
I've just taken in a 5.5m Rib which fits your requirements. Good size with wide beam so stable in the water, clean tubes with no patches or leaks. Good roller trailer, 90hp motor just serviced within the last month. Ready to use. Easily capable to carry 5/6 maybe more. Console seat with another bench seat behind it. Radio fitted.
Best bit is its under budget at just £4750 for a quick sale. If it's of interest get in touch and I can forward pictures and even get a video taken showing it on the water at speed.
Location is Plymouth but delivery can be discussed dependant on your location
Peter @ Boatsandoutboards4sale ~ firstname.lastname@example.org
~ 07930 421007