The first-generation Pacificas all had seating for 6, in a 2-2-2 configuration. I think it was the 2005 model year that brought a bench seat option for the second row with no third row...only storage in the rear. If you need the five seats make sure it has the bench in the second row or, as another poster said, you'll have little room for luggage.
I own a Pac with the 2-2-2 config, and have 2 kids. We've driven it to Disney as well as other vacation spots and it actually does hold a good amount of cargo as long as you are only using first and second row seating. I think the most we had back there was last summer when we packed four HUGE duffels, two sets of golf clubs, laundry basket, laptop, pillows, a few misc. bags and two beach chairs.