Without having looked at them, i have always used the phillosopy(sp) buy the best available, everythime i havent ive been dissapointed and upgraded wihtin a few years, take my current pc, brough a state of the art pc wiht a 3 gig cpu well over a year ago, and its still up there in the top several pcs available (i think), but like my 6x9s i brought them on an impulse, and i was skint, the money would have been much better spent on some components, now im replacing all the ICE i brought wiht quality, expensive stuff, all cept the HU, which was one of the best i coudl find, as as a result i paid £300 for it over a year ago, was one of the few around wiht mp3 support, havent regretted the HU, but all the speakers i brough were cack, and cheap.
I know its not cheap to begin with, but my advice is buy the best, and then u;ltimatly youll be happiest wiht it.
Just my for pennys worth.
Rant over!