How much money for cables?? Well,you're here asking such questions;which makes above Joe-6pk.level-if you know what that refers to.
To start; with regards to your installation, how long will/are these cables be?? As we all know;longer costs more. Your post says HT and MUSIC. I would start with the 'music-part' i.e.2ch stuff.--Ya'all got a 2ch. pre?--or is this music going thru you your pre/pro? The fronts is probably the best place to start and improve;whether this be 2ch or HT. After you find out what length you need--- look thru the used stuffs,here. I rec. stay with popular brands and resell them for near what you paid if they don't seem worth the money spent. Like many here,I think there is room for improvement;If you want to go "there".