As far as I know the head gaskets on the 2nd gen cars (after 1999) were all okay. I would think the timing belt has a life of 100k miles, and my personal viewpiont is that I would replace the water pump (and the idler pulley) when I did the timing belt. Beyond that I think its just the usual oil change intervals, and tranny filter and fluid change intervals. Mine is a 97, so I cant be certain. I like to change electric fuel pumps after 15 years or 150,000 miles, but lots of people just ignore the pumps, until they give a problem. I dont think Dodge/Plymouth has any recommended replacement interval for fuel pumps and filters on Neons.