Take a look at this sight... http://www.signsupply.com/Vinyl/FDC/3503.asp
They offer the mask you're looking for. I just pruchased the Roland SX-12 and really like it. The included software is not that bad. You'll have to make a lot of decals before the machine pays for itself, but the convenience is priceless.
Can anyone recommend the best vinyl for decals? I'm going to use it on foamy planes and larger RC gas planes, boats, cars etc.