Stereo

Can anyone help me my Cruz is a2014 lt. Im interested in a better stereo system. Any suggestions i like the stock but i like my music a bit louder. Better system and speakers with not going broke. I've all ready got my amp and sub woofer. Btw im not smart wise when it comes to this. My friend or bench mark will be fing the installing. I want to be able to keep all stereo features i all ready have. Ty and gn