There are a few options or "roads" that you can go down with brushless. You can go with the Entry level Novak systems that are convenient and are easy to get help with if something goes wrong. They offer plenty of power for most guys just taking the step into brushless and I think that you'll be happy with it. Or you can step into the "high" end systems from companies like MGM, Schultz, Lehner and Pletenberg.
For more information head over to [link=http://www.rc-monster.com]RC Monster[/link] the guy that runs it is named Mike and he hands down has the most knowledge on brushless systems. He not only sells systems on the site but he also has forums that are really helpful. Just do a search first because I'm on there often (more than here) and I know that we've answered your question many times. Hope that helps.