The Salamander synergy twin 20 has the exact specs you're looking for. I don't know if it's still available but that's a good place to start.
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Yes, the salamander twin 20 is available and it will work well. Another option (depending on size) is the triple 20. I just got one and I much prefer it to my older "single" 40. There is a triple 20 for sale on ebay now. If you happen to live by the guy, it will be a good deal. (Not my auction, just noticed it was there....)
I purchased a Salamander cabinet that holds six components. Front doors are available and so are back panels. The Salamander cabinet comes with a "steel bracket option" that attaches the TV to the cabinet and allows it to float. This is less expensive than a wall mount and does the job perfectly (for me). please see http://www.salamanderdesigns.com/