I'm looking for an air compressor for my shop(my small 2 car garage!) and wondered if anyone had any suggestions? I would like to use it to take off/put on blades as well as a few other small air tools. What size do I need? I would like to get one that is smaller, but will still handle a impact wrench. I also would like to get opinions on the ones that hang on the wall. Space is somewhat of an issue. Thank you!