What air bag / compressor / brackets / whatever should I use?
This, like everything else, is a matter of opinion. I can’t recommend something that will please everyone so i won’t begin to. What I will say is that quality parts will make your life a LOT easier in the long run. If you have to save up for a year to afford it, it’s better to do just that. You don’t see many peolpe braggin about skimping on parts because they will usually end up replacing the cheap stuff in the end. The price is cheap for a reason!