Help About to buy a 2004 Quest ???

Hey guys Im looking at two Nissan Quest's they are both 2004 SL models one has 45k and the other 37k what do you guys think I should look out for In these vans I'm not to familiar with their wear & tear pattern's (I Don't know what to look for) I guess what I want to know Is what are the expensive fixes to look for I'd really hate to buy the van than have to spend 7 or 800 dollars on it. Also where should their Maintnace history be at??? Thanks a lot!!!