For your taste of music, I would highly recommend components in front without adding a subwoofer.
This will concentrate more on vocals, and will eliminate any sound-muffling problems usually created by sub. Head unit:
USB only (Not iPhone compatible)
JVC KD-X30: ~ 3200/- (Chandigarh Carlife-Sec28 quoted me less than 3.2k for X30 and less than 4.2k for X40)
Good SQ, 2 Pre-outs, Parametric Equalizer Front speakers:
Morel components: ~ 6.5k (They have awesome vocals, with better bass than most treble-friendly JBLs)
HERTZ ESK ~ 7k Rear door/tray speakers:
Co-axials of same model as above components: ~4k
Adding a sub would require dampening, rattle-management, and extensive amp wiring.