i use something like this
bought from a fellow LYN..decent and quite cheap set..i've complete 4 1/20 kits and 1 1/72 military kit..can browse and search around.. 
but can't AB non stop...after 1 hour of 80% us, start to have some funny sounds...so have to stop..continue next day..i reserved around 1.5 ~ 2 hours of modelling per day..so this compressor set quite enough for me... 
and maybe you can invest for a single action tamiya/procon boy AB... hope this helps