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Given the budget of 25k and requirement of good bass, you definitely require a subwoofer. Your best bet would be to invest in a powerful 4 channel amp, front components and a subwoofer.I listen to mostly edm / hip hop / r&b / rock.
I got a system installed from one of the popular shops in Delhi. It included a single Din Pioneer HU for Rs 5500 , Pair of 6.5 front components from hertz , and pair of 5 coaxials from hertz in the back. Also wiring for Rs 800 and damping for front doors for Rs 1800. The total cost of this came out to be Rs 19000.
However, I was disappointed with the sound quality as it was so flat that my my mobile phone speakers and a portable Bluetooth speaker did a better job. The bass was non existent without the woofer. I inquired, and they quoted another 20k for decent subwoofer + amp addition.
They offered to remove everything if i was not satisfied and i agreed. Removed/returned everything except the wiring and the damping and spent around 2.2k and still without a sound system in my car.