re: Best commercial printer for printing bright colors?

There are limits to what standard CYMK inks can produce. The way your monitor displays color is not the same way color is reproduced using inks. I suggest you seek a commercial printer. There are ways to get a wider gamut of color but it will take a pro to make it happen. I've worked in the printing business for 30 years. Explain in more detail what you are trying to reproduce and I would be happy to help.