Yes i did not suggest components at the rear because of your budget , if you can afford it then go for it. If possible also try to get a JBL 4-channel amplifier for powering both the front and rear components instead of 2-channel.
I would say if its possible to fit in the rear doors then go for it. As time passes the parcel tray will produce vibrations and rattles which will be annoying.
I would say if its possible to fit in the rear doors then go for it. As time passes the parcel tray will produce vibrations and rattles which will be annoying.