Hello guys,I just installed a new pioneer X5750BT head unit for about 2k including installation at my local shop. I plan to upgrade my speakers as well as adding a subwoofer Any recommendation?

My local shop recommend me to install two 6" component speaker on front doors and a 12" custom subwoofer behind the boot then adding two pieces of amp. Anyone got better suggestion?

I do hope that I could get a better quality of audio instead of just booming or blasting the subwoofer Thanks

Thanks in advanced