I usually wind up going to the Makuhari Costco, unless I feel like going to Fugetsu, which is in Shinmisato (despite the transfer to the Keiyo line, Makuhari has the advantage of being in Chiba).

One added bonus to Makuhari is that it is fairly close to the New Otani, and the views in the cafe on the 25th floor or so are quite nice.
(the view is somewhat blocked by the APA - which was originally a Prince - I haven't had the courage to venture there, although if they had a cafe on a higher floor I would visit at least once).