Sony xav-ax700 vs alpine ilx-w650 with power pack

[savage388]

Im looking for an upgrade over stock in my wrx. I just need enough power to drive maybe a set of dsk165 or similar components up front and probably coaxials or mid-range in the rear. Will I be missing out on features or power with either unit? I do really like the simplicity of the sony not having to run any wires or mount anything to get 45x4 watts rms. Also could I run say a 6.5 mid in the rear without a tweeter to keep the highs up front and not lose out on 2 channels of volume?

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