In the AVR series, the last 2 digits of their model numbers indicate the year. It looks like they list at $400 and go up rapidly from there.
http://www.crutchfie...eatures_and_specs
Lots of things to consider, unfortunately. It's probably pointless to try to futureproof the purchase - things are still changing pretty rapidly. I'd suggest listing your immediate needs, picking a budget, and not agonizing too much. I wish I could do that. ;-)
Some places seem to have that for around $325, but it might be like cameras - if it's too cheap, then you don't get a US warranty or something. Dunno.
HTH. Good luck.
Cheers,
Scott.