Who makes the lowest maintenance compressors

One other factor to consider is the "ford factor". I had an old ford, the joke was the name was an acronym which stood for "fix or repair daily'. The plus side was the ford was laid out so replacing starters, alternators, water pumps, belts and hoses was easy. Later I got a chevy, which expected you to yank the engine to replace the starter. So the other part of the equation is: "how many man hours each year to maintain". Some are a snap, others represent a bigger challenge.
 
Airetex I have an Airetex 45 . I bought it because I wanted "plug and play". That is exactly what I got. It has a moisture filter and is built like a tank. I fill my tank as well as several of my shooting buddies. In one year I have a little over 8 hours on it and it performs like a champ. Highly recommended, if you can swing it, get one.