I agree with sticky about the square subs. not the greatest sq but they get very very loud. And I think you will be missing out on the lows if you get some tens so go for the 12" L5's which are also 600wrms each. They are a step down in quality from the L7's but a step up in size and I believe that you would be more pleased with them versus the L7. That is, if you choose to go square.

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Vehicle: 2004 Chevy Aveo Hatchback
Battery: Stinger
Wire: W.S. 0 Guage (ground/power strait to battery)
Head Unit: Eclipse CD3000
Speaker Amp: Infinity Reference 7521a
Subwoofer Amplifier: Infinity Reference 1211a
Speakers: Kicker Titanium 5.25"
Subwoofer: Image Dynamics IDQ 15"