The HU is really good particularly the Bluetooth feature. I got the HU at Rs.18500/- from Fancy Car's World - 106, General Patters (GP) Road, Chennai 2 -contact person Mr. Habeeb / Rizwan (9884049390, 9840023591). I also installed the rear camera which costed Rs.1400/- and it is really useful. I did not install rear speakers as I wanted to restrict the after market fittings to the minimum.
Fog lamps are good in terms of safety (night driving) and looks. BTW the head lights are bright and sufficient for highway driving and fog lamps gives just the extra boost.
My suggestion is that you may go for Velcro mats immediately on taking delivery as the Toyota carpets are small in size and do not cover full floor area. Further, you may go for Toyota security system, fog lamps from Toyota dealer and other can be sourced from market.