I use all sorts of tapes for different jobs. I agree Tamiya is very good and I use for for smaller jobs, but for working out graphics, I use 3M tape I get from COASTAIRBRUSH.COM out in Cali. It's the tape Craig Fraser uses for his graphic tape work. I use a piece of glass or smooth tile to lay it down and cut it into small strips (in scale) and then apply it.
Once the tape is down, I mist a coat of clear to seal in gaps, etc, and then you are good to go.