When you buy a used car it's a good idea to do a complete tune-up right off the bat so you know in the future what has and hasn't been done...and that it's been done correctly. Change all the filters, plugs, oil, service tranny/rear, lube/inspect chassis, inspect brakes...I flush the coolant and put a new stat in too but i'm paranoid soo yea. Pretty much anything that can be done i'd do it...your car will thank you later.
I'm surprised you haven't been flammed yet for posting a searchable non-techish thread in the tech section lol.