Due to a stuck CD-changer (been like that for 3 months already), I finally brought it for repairs only to be told that I may as well just buy a new HU with MP3 functions. I was advised that it is not worth it to repair my CD changer as there is no guarantee that the problem will not come back again.
Eventually, I took the plunge and got the HU mentioned in the subject and got a pair of tweeters as I was guaranteed a vast improvement in the sound department. What a bl00dy difference it made and it was the best 400 bucks (traded in the old system) I spent! Even though I didn't get the top of the range stuff as I'm not into ICE at all, I still thought the difference was well worth it.
Just want to share my experience with others who may be in the same situation.