A 4cyl, will run as long you do, if serviced well and routinely. As for the price, im no expert by any means but that seems like a steal. As long as everything is in good shape. But the 4cyl has the testicular fortitude of a 7 year old girl.
So if you do alot of highway, hills, or live in a windy area, i might suggest looking for a 6 cyl. haha im just a little irked at the wind we had today,
but if speed isnt a necessity then a 4cyl will work just fine