Audio 2004 Accord Euro Luxury

Hey guys just wanted to get opinions or suggestions from you guys...i currently have my phone connected through the tape aux thing that i have and i find generally the sound seems alright but with certain songs the treble cracks the in dash tweeter but again this is for some songs and not all...i am happy with the overall performance of the speakers but would it benefit me to install a separate head unit and keep the current speakers or stick with the factory 6 cd changer unit and change the speakers instead...I am in no rush to get anything right now seeing as how christmas is around the corner and i'm sure prices would drop in the coming weeks...Thanks