those speakers will be leaps and bounds better then the clarions. they will also be much more expensive though. infinity speakers are hard to beat at that price. great bass and amazing highs. definately a go on those speakers.
as for subs, i would get the infinity perfects. if you can, bump it up to the VQs. they are awesome subs for the price. if not, the regular perfects will do.
enclosure- subthump.com
i'm sellin my old amps as well
http://www.njfboa.org/forums/showthread.php?t=18801