Another vote for the Viar 88P for all the reasons listed. It's as quick as many other more expensive models I've seen people recommend and has served well for multiple vehicles/uses for me.There are all kinds of air systems but the simplest and cheapest is a portable unit that you have to clamp onto your battery terminals each time.
I've been very happy with my budget Viair 88P. It is affordable (~$70), simple to use, small, lightweight, can be moved to a different vehicle on the fly, and fills tires up fast (I've used it with 35's and below).