I agree with Hawkeye, but if you insist on buying new, you will find that Denon, Yamaha, Onkyo, Marantz, etc usually incorporate a very high percentage of the parts of higher-end models in their lower end models...the trickle down effect, if you will.
For a 2nd system, I'd rest assured sticking with these reputable companies "low-end" models.
There's really nothing "low-end" about them...you're just paying for less features, less power, less bells and whistles, but not less quality.