Polk makes ok speakers... But not good subs. I will put a $140 Tempest up against your Circuit City Polk MOMO sub anyday...

Boston Acoustic is the same way... Decent Comps but not-so-great subs... at least when you are talking about REAL car audio... i.e. Xplod everything sucks... Rainbow Platinums rule... Arc and Pheonix Gold Amps only...

Basically, do you want a Circuit City system or a Real system.

You should do some reasearch on these things in car audio forums... I have a feeling most people here don't know all that much.

www.elitecaraudio.com is good

NEVER use SoundDomain.com that is a pile of ****...

www.termpro.com is ok too

It's a shame there isn't really a VERY good car audio forum yet.