i cannot reccomend highly enough a good spec pioneer stereo mate even on some standard speakers they sound quality you get so many different settings to choose from its unbelievable, i have one in my erst its probably 5 years old now and cost 400quid so god knows what the new ones are like but this thing is the bollox. most stereos leyt you det bass and treble and thats it but my pioneer lets you set everything even things i dont properly understand lol! but you can hear the difference it even lets you set different parts so you can set it to sound better from drivers, passenger or rear seats or any combination of the above!! but as far as speakers go ive always found kenwood to be pretty good and if you contact there website they can reccomend you sizes as they actually reply which makes a refreshing change from some of the bigwig websites lol! i cant even get a reply from nms!!! i would ring but i work dodgy hours at the best of times lol!