Sir, In addition to the long lists of cliches from various correspondents (at the end of the day, I believe, what you're saying is, obviously, etc), I plead for a brand-new one introduced by the intrepid Moire Geoghegan Quinn on Liveline; namely "indeed".
It has limitless interpretations, from meaning nothing to meaning anything. Yours, etc.,
Duncormick, Co Wexford.