i am helping a friend picking out a system we decided on the amp and the deck already -p7700 -kicker 600.1 or xenon 600.1 i dont know much on sq subs but heres what we have so far - looking to spend 100-200$ price range -15" SE -12" typeR -how are the xenon 12"s (are they even sq) -how are the 6.5 comps ?