Congratulations on getting your new car.
I can give you some advice, hope it will be of some help.
As far as your stereo is concerned, changing speakers and adding an amp plus woofer will definitely make a difference. But the real deal is the dvd player itself. Go for a branded dvd and your sound issues will be greatly resolved.
I would not suggest that you change the seat. Your car's original seats are quite comfortable. Try adjusting it in a way that you can compromise with.
I don't recommend changing the seat because one it would be too costly from indus.
Second, Grande seat would be leather while your other seats are fabric. It will look odd unless you get it redone in fabric. Then that fabric won't match with the other seats.
You can look for Australian model seats (the entire set) from the scrap market. I know one set is available in pindi. But that is black interior. Plus then again it's very very expensive.
The car's headlamps are okay. If you want more power go for LED bulbs on low beam. They are available easily these days, and will surely improve visibility.
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