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HR put together a report which named a whole heap of chips. They cover a wide price range; I was picking $300 as sort of a midrange number. The costlier chips tend to support higher speeds, and may have more features.
And yes the Adtran Opti6100 does look good -- it was in fact my recommendation for a space-constrained application. It tops off at OC-12, and assumes that you have another vendor's SONET backbone -- Adtran is focused on access, so this MSPP doesn't get very far on its own. I seem to recall a missing feature or two, but it does more than most of the (cheaper) micros.