@shaz008
Thanks for a very pertinent input! I didn't think of this issue before. Now that you have suggested me to replace my stock cd changer, and get the 2007 model console, I feel I'll have to save some funds for another few months before I go for all the excercise!
Now I understand that 'after changing my stock Pre', I'll get a good DVD/CD player, and than look for a 4 ch amp, a pair of component speakers replacement for my front speakers, and a 12" sub. I can fix my stock front speakers in place of rear speakers as they have good output. I shall fix the amp under my seat, and sub in a 1.5 cuft box in the boot.
All this is likely to cost me around 30k! I have around 16k available, so I'll wait for 3 months before I go for all this!
Finally, a simple advice required: Where in Rwp/Isb can I get the stuff I need, and who's the best audio electrician/shop where I can take my brand new ride for all this 'stripping' and 'fixing'!!?
Thanks a lot everyone for the help and advice!
Regards!