With the DA Sander, is there a comperable electric tool that will do the same?
Yes there are. That is what I ended up swapping to on most of my "air sucking" tools. I now have electric grinders and sanders and they work just fine! BTW
I am just using this compressor to paint and it keeps up fine...
I am sure it would struggle doing a car since the tank is small, but for bikes it is great.
When doing the complete bike I just did it came on one time and I never noticed a difference.
Also the guy at Finishmaster advised me to use the shortest air hose possible to avoid pressure loss. So, when painting, I only use a 25' hose and pull the compressor out so it is close to where I am painting.