I prefer the GR06 to the GR02 (as Kova4a said, it's a smoother, more lush, more detailed sound overall), but I think you'll be happier with the GR02. It has a little more bass, and is well suited to the music you listen to. I consider it an excellent beginner's IEM. It doesn't hurt that it's also dirt cheap. I love the GR06, but it's not twice as good as the GR02, but it is twice the price.
Buy the GR02 and stop worrying about it. You'll love it.