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Shane's pretty much covered it. Just some of my thoughts here.. (since i'm looking at receivers myself)
If at all you are going to get outboard power amplification sometime in the future, then pre-outs are a requirement. Entry level receivers don't usually have them (exception: Marantz SR4400, AFAIK).
If you have a few video capable devices (Cable/Sat, DVD player, VCR, PS2/XBOX, DVD recorder etc) and not enough inputs on your TV, then you'll need video switching. Generally, HD devices are recommended direct to TV, and then you might need component video switching for the DVD player.
If you have a lot of HDCDs and don't have a compatible CD player you might want to get HDCD decoding on the receiver.
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DVD-A registry for hirez/surround audio
Bluray, DVD-Audio, DAD/HDAD, DualDisc, MVI
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