If DIY is not your cup of tea, you can always get a Sanus rack CFA56 or CFR127. Both have adjustable shelves and glass doors.

Also, if I were to build a new home theater, I would probably install one of these bad boys. The swivel-rack looks pretty nice!
http://www.avrak.com/avtrak.html

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Denon 4520, EPIC80/500/VP180 Speakers