I've had a great Onkyo receiver for the past 10 years which is an old Pro Logic II. Now it's time to upgrade. Well, it's actually way past time to upgrade. I've been looking at the present Onkyo's but I've also been looking at the Yamaha's. Does Yamaha have the oversized "guts" like the Onkyos? Any other comparison differences? I'm looking for a receiver in the under $500 range. Thanks!