Depending on what you do that brush should be more than fine for you. If you decide later to go into german squiggle camo or intricate camo patterns an internal mix, double action, gravity fed might do you better but even then, there are ways to do it with what you have and some good masking skills.
Music City here has an article he wrote on the very subject which might help you get a better idea of the differences between the types of airbrushes.
http://www.craigcentral.com/models/ab.asp
On the other hand, if you are just itching to get you a new brush and trying to find a reason, go for it!! ![Wink [;)]](/FSM/CS/emoticons/icon_smile_wink.gif)