Wolf,
So long as your scheme is too not wild it might be cheaper to have the graphics done by your painter. I have had 3 bikes repainted now with graphics painted on. After looking at the tape alternatives it always worked out better for me to have the graphics done as part of the paintwork cost wise.

You can also try check with a local sign shop that makes signs for vehicles. They use materials that do well in weather over time. You can create your own graphic on their computer with different colors and shades.

Get them before the painter puts on the clear coat. He can put on your graphic and clear over it. That will give a nice 3d effect with out looking taped on. If you decide to go this route call your painter right away and let him know so he can delay between primer and paint.

Good luck!