Adcom GFA-7707 or new GFA-5705

I have a chance to buy a used 7707 and a marantz av7005 for around 1700 for the pair
but sell the 7005. but I have been looking at the new Adcom GFA-5705 looks nice but hard to find any reviews. the 5705 is a bit more then the used 7707. any suggestion.

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