does any one have any recomendations for a compressor for automotive painting,

i will be only using it for side prodjects so i was thinking something portable

but to be honest i have no idea what what would seperate a good compressor from a bad one

i will be using it with a satajet 3000 HVLP for top coats and a sata klc HVLP for undercoats
http://www.sata.com/Produkte/produktliste.jsp?gruppe=01-%3F%3F

any advise would be greatly appriciated esspecially specific compressers that you have used and liked or disliked

thanks for the help