I was suffering major analysis paralysis, when I bought my first real garage-size air compressor. In fact I got so stuck, trying to figure out what to get, that I put off buying for years after deciding I was going to get one. Then one day, as I was using my portable 12v pump to air up my tires after visiting my third gas station in hopes of finding a working air pump, I said "this is STUPID" and I rode home, got my car, drove to the local auto parts store, marched in and bought the first suitable compressor I saw that fit my budget. I think I paid $60 or so for it. That compressor lasted six or seven years and I was happy I owned it, every time I used it. When it developed a leak that made it less powerful, and I couldn't figure out how to repair it without getting it welded, I went to Sears and bought a similar size and configuration compressor for a little more money, that will hopefully last longer.
One of the things I later bought to go with it, was a $20 impact wrench from HF. I have used that wrench maybe five times, but every time I was thrilled that I had it - it made otherwise-nightmarish tasks, easy as pie. I also use the compressed air nozzle to do things like blow through carb jets or blow the dust away before I pull spark plugs. And of course I air up tires. I don't do painting or nail guns or anything like that, so I don't use it heavily. But when I use it I am always so glad not to be dependent on gas stations.
Anyway, my recommendation is, just buy one. You can't go wrong.