I think Standard English from UK.and more clear and nice.American English is not easy to learn unless you live there or you really have much chance to talk with those guys.

UK you can find , English partners :- http://www.italki.com/partners/1--English--200-0--0-0.htm

lol no bad feelings. bulgaria... ken lee, dulibudibu dauchu, ken leeeee ken lee meju mo. it was "english" can't live without you ;)

America, because nowadays England uses just as much slang as the U.S also American english is more popular thanks to Hollywood and its entertainment industry. Even people from England are now trying to learn American english

Hi Fernanda, it depends how much money you have to live and study in an English speaking country. Apart from England you also could travel to the USA and Australia.