kicker kx550.2 would be great for then, it is about $250 on ebay. The VMAXs are 300 rms I think and even though the amp is rated at 550 watts it will put out something closer to 600 watts.
Oh, and did you get SVC or DVC vmax? You need DVC for this amp.
Why would you get an amp that has twice the power you need? If you are going to get JBL get a 600.2 for two VMAXs. It is a good amp but not as good as kicker, but it also isn't as expensive.