This is the one.

Over the years I’ve tried and paid for several applications to manage my gmail. I use gmail as a hub to organize several email addresses and manage my business with it. Nothing came close enough to the familiar interface of gmail, access to the settings, searching on the server, etc. etc. This is like a window to the fully functioning gmail application. Have now uninstalled everything else, istalled this app on my Mac and on my iPad and am very happy. Thanks!

Pixeldrummer about Go for Gmail - Email Client, v2.2