Congratulations on your car Umair.....MashaAllah.....
And I must say lucky you, got an mp3 with USB and AUX option......good to see that..
As for the tires, i have a 50-50 opinion. Euro Star sure provide you better mileage with this width (175). But they sort of lack that grip to facilitate your cornering at abt 80 or 90 Km/h. Also ABS will engage soon when you hard brake compared to a tire with higher width (185 or 195).
I would say, no need to change it. For me the result was somewhat (only somewhat) softer suspension) and way better grip at the loss of fuel economy and road noise (well may be my bad choice of the tires). I wanted somewhat heavier looks with stock rims.....
But dont know for some reason wouldnt recommend that. Looks are for people, economy is for you.
And likewise aftermarket alloys wont suit much with these euro stars. So.....
As for the speakers, if you are not a loud music freak, any good pair of Pioneers, Kenwoods costing b/w 3-4K in the front with the stock ones shifted to back will do a great job. Baqi jitna shakkar dalo, utna meetha pao.
With some cash at your disposal, i would say good quality (ranging 6K plus) fog lamps would look pretty attractive. (not those 2500 ones).
And if you have a mind towards fabric seats, get a cloth matching the original ones. Its available in the market with a combination of fabric color on door handles. Looks pretty good to me. And please dont spoil the interior with Black Leatherite.
Go On. Enjoy the ride. Drive safe.