I have one of like in the URL (I don't know how to make it clickable!) below and really like it. If you watch you can find it on sale for $80 or so... Though I think it is a good deal at the listed price.
Actually used it once to keep my 80 gallon compressor tank charged to complete a paint job on a car when the motor went on the big compressor. It ran steady for an hour was real hot but lived through it. It is a bit larger than the "pancake" style but still plenty portable.
http://www.sears.com/craftsman-3-gallon-horizontal-air-compressor-with-hose/p-00915310000P?prdNo=2&blockNo=2&blockType=G2
