From my experience:

Black will be most expensive, if you want it to look really good.

On the red choice, use good quality paint, even though it will be substantially more. Cheap reds will fade badly.

The prices will run between $500, and $10,000 depending on who does it, whether they use quality paint, and how well they do the job. If you spend less than a couple thousand, don't expect much. If you find the right guy, $5,000 should buy a very good job.