Those Hitachi's are sweet, but yes, heavy. PC seems to be a good choice as they're abundant, cheap and service parts are available. My portable is an EMGLO that I bought in .... 1982 or thereabouts. I've ringed it and changed flutter valves once as well as routine oil changes, and I'm convinced it will outlive the next person that owns it.. When I've used it for high-draw situations (small sanders, etc) I gang it up to a 6 gal. expansion tank. That tank is one of the best accessories you can get for a small compressor. Gives the air time to cool and condensation falls out. The Rolair products are excellent, but pro grade and not cheap.
Rolair Compressors - Manufacturer of Contractor Grade Air Compressors