hey I Love my air tools I have all air tools. I say air if you have a compressor. I run all mine on a 120 gallon 8 hp compressor usually @195 PSI. I couldn't make it without my air tools. much cheaper tools. Air DA is $7.99 from Harbor Freight. Plus you'll need a line sander if you plan on major work. never seen to many electric line sanders, they are $19.99 from HF as well.
Heck i found this compressor an it only needed the reeds cleaned. It's a Freebie and works great and will keep up with my Air DA sander.