Which Air Compressor should I buy?

A little late to the show here, but I have a 5hp 220v Husky, its great for air tools, but I do quite a bit of sandblasting and it doesnt keep up....gotta do the nosepickin' waiting game with it, next one will be a 2stage. One thing I heard from an ol-timer. Run synthetic oil in it...pricy, but when you think bout it how often do you change oil?? So the cost is negligible