I concur with the above about avrs quickly getting out of date. The question is, can one be satisfied with being out of date. The sound quality of a system doesn't go down simply because a new codec or system comes out. However, new tech that the old avr can't deal with, like 3D or 4K becomes an issue.
I've recently updated my 6 yr old Onkyo avr. The good news is that avrs can be heavily discounted. I'm back in the Denon fold, every fall when they release new models, the old ones eventually go on sale. The Denon 4520 listed for 2500, but now can be had for 1100 brand new in box. It's a little more than i wanted to pay, but the audio quality with the new room correction is quite impressive.
I've recently updated my 6 yr old Onkyo avr. The good news is that avrs can be heavily discounted. I'm back in the Denon fold, every fall when they release new models, the old ones eventually go on sale. The Denon 4520 listed for 2500, but now can be had for 1100 brand new in box. It's a little more than i wanted to pay, but the audio quality with the new room correction is quite impressive.