Go audition. I'm not a big fan of the 600 series, I think you can do better for less money but it's up to your ears. If you have any other shops around hear every other brand you can like Paradigm, Focal, Era, PSB, etc. You name it, if they have it give it a shot!
As others have said though, how they sound in the store doesn't tell you everything about how they'll sound when you get them home so make sure you purchase from someplace that has a good return policy or even better will let you audition them at home.