Has anyone had any experience with both of these receivers? I'm considering the 703 but started noticing the 702, last years model. It looks like the main difference is the XM readiness of the 703 and that the 702 has an optical digital output which the 703 lacks. If I can pick up the 702 cheaper on clearance, I'd like to unless someone can fill me in on why I should go with the 703. I have little to no interest in XM and my current receiver, which I've had for over 5 years, has never had the tuner even turned on. Thanks.