Hi Rebecca,
It's hard to say without seeing a floor plan, but do you have room for a drop-leaf table? I'm thinking of something that could perhaps do double duty as a kitchen prep surface/island and then the leaves are raised when it's time to eat. One that opens up to a round table would accommodate 5 people in less square footage better than a square or rectangular one. Another option is a small table that allows you to add extra leaves when needed. Or a fold up table. As a general rule of thumb, it's best to allow 24" of space for each person.