Town & country repair estimates

I have a couple of questions. I just bought a 2000 chrylser Town & county a month ago. I took it for the first oil change since I bought it and the guy gave me a sales pitch about things I need soon. The car has 118,000 miles but I know the previous owner and the dealer are excellent. The dealer serviced the car for everything while the first owner had the vehicle and the previous owner was the only other owner. The guy at PrecisionTune Auto Care where I had the oil changed said the fuel filter needs to be changed soon but costs $140 and the regular maintenance tune up, plugs and such, costs $180. He said the fuel filter is the original but it's above the fuel tank so how does he know it's the original and does it cost that much. The plug replacement he said takes an hour and a half and thats why it cost that much. I have not been to this garage before and I was wondering if these prices are accurate or if I should go elsewhere.