Chips, you may have already fully considered this, but note that the R-671 is a 6.1 rather than 7.1 receiver. Although you presently have a 5.1 setup in mind, unless you're fairly certain that you won't want to expand to 7.1 you should keep in mind that the 671 has neither the amp channel nor the pre-out for the 7th channel.

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Enjoy the music, not the equipment.