look at the Oracal
810 810s http://www.oracal.com/products/product.asp?seriesID=186&tabID=ts
811 http://www.oracal.com/products/product.asp?seriesID=187
813 http://www.oracal.com/products/product.asp?seriesID=189
all are what I'm starting to use to airbrush with you can contact Oracal and they will send you some samples also for free.
Hope this helps