My ride: Persona Elegance 2012

Prefers SQ/SPL/SQL: SQ but little high preassure/bass will be nice.

File format/medium used for my source: Mostly through Spotify on iPhone.

Music genre: Varied, mostly alternative rock and classic song.

Budget: RM1000 - 1500

Setup type preferences:

Other requirements (if any): I would prefer to change headunit first to anything that have touchscreen lcd around 6.1" and support iPhone usb . Any brand or particular model that you guys recommend?
( Prefer headunit that directly support iPhone and bypass DAC)

Then maybe going for nice front speaker since Persona doesn't equipped with front speaker.
If the budget allowed maybe an amplifier or a subwoofer.lol.

Thank you guys.