You may wish to consider a Rolair JC-10 - a twin cylinder and tank unit. - I bought one to replace my Iwata twin cylinder and it is quiet (60db) when running - it also shuts off when it reaches pressure. Noise is equal and maybe quieter than the old Iwata . It produces more than adequate amount of air (2.3 cfm at 90 psi) and is portable. You will probable need a moisture trap. Can't figure out how to put a picture here so look on Rolair website. There are other similar units by other companies (Senco, etc.)