An accent is the result of your own dialect and should be as unique as your finger print.
By all means get your P's and B's in order, but I don't like the idea of actually intentionally acquiring a certain countries accents for 'showmanship' purposes. Why not attain a more extensive vocabulary which is crucial for expressing yourself.
Under the same reasoning, why not use that energy which is a vital commodity attempting to read as many books laden with knowledge written in the language you've concerned yourself with perfecting. Why not learn a new language if the linguistics is your cup of tea so long as you have something to say, in a progressive world it will always count more than how you say it.

NUCLEAR WEAPONS: IF AMERICA AND ISRAEL CAN HAVE THEM - THEN SO SHOULD IRAN.