I've done my Harley with duplicolour metalflake black with a clear coat over the top.
Make sure the preparation is perfect. This includes filling, sanding and finally washing it down with a good quality wax and grease remover. Make sure you follow the instructions on time between coats and don't do it when it's too humid or wet or windy.
Once you have put on the last colour coat, go straight for a light coat of clear before the colour completely dries, this way you'll get a good bond and it won't flake. I also addes some pin stripe tape before finishing the clear coat. The top clear coat prevents the tape from peeling.
It's not a show job, but the bike is a rider, so it's good enough to look good, but not worry about the occasional stone or weather beating.
See my album for a bit of an idea on what you can do.
Mick