Sue,
It all depends on how you intend to use the dink. If you're on the hook most of the time and not too near to "civilization" you'll probably want a good RIB like an AB as the dink will be your lifeline. If you use the dink just to putt around or go a few hundred yards to shore or a buddy's boat any old dink'll do. I'd keep the Achilles.
Mine is the AB second from the right.