best setup for amp?

i have an alpine mrd605 amp that can put out 600 rms what would be the best sub or subs to get good clean hits and yet still plenty of sound. they will be going in the trunk of my car. thanks

i was looking at the Massive Audio CW 12 is that a good sub what kind of box should i put it in

the company website usually has some good specs for box and port sizes.