What's up azine members,

I am currently trying to put a nice clean system into my car because I recently realized how shitty the stock speakers are. I have an 04 auto TL and was wondering what sizes and brands to look at. I don't know what to look for or what is good, but I know I would like a nice clean system with a sub that isn't too crazy. I also want to preserve some space in the trunk if i get a sub so which would be the best route to take? Should I even get a sub or just get speakers.

Any advice would be greatly appreciated, thanks in advance.

-Kunj