depends on how seariuos you want to go into Audio
i had polk momo stuff in old car , cost a real packet but was absolutley awsome,
had a mixture through out my motoring days , MTX slegehammers all the way for subs !!!
i think the infinity 6x9s are good for the money as are the pioneer range
i am thinking of replacing my speakers, for eom fitting ones
dont want to go crazy as keeping oe headunit (for now anyway ) think i want clarity and a little punchy bass