Maybe I can help you out with another recommendation. I bought this TJM compressor a couple of months ago and am VERY impressed.
Truck Accessories and Jeep Accessories By Central 4 Wheel Drive - TJM Portable Compressor
It's relatively inexpensive compared to others, and has unbelievable power. Maybe not enough for power tools, but certainly enough to air up any size tires.
In fact, I just used this last weekend and it aired up my tires and masphx's tires (8 tires total from 25 to 36psi in about 15-20 minutes) without interruption and not overheating. It can be hard mounted if you choose, and has a auto shutdown if it gets too hot.
Only negative, it has a detachable filter that will not fit inside the carry bag if left on. It is easy to screw on/off. The lesson I learned one night of wheelin', I was sort of in a rush because it was getting dark and I forgot to put the filter on while I was using it. Well, my headlights were attracting lots of bugs in the desert and one curious moth got to close to the air port and was sucked into the compressor...HA! I was airing up and heard the compressor fault for a split second. I knew immediately what had happened, and it didn't cause any issues. I took it apart and got the bug out later. But, lesson learned. Don't use without filter...