Where is the best and non so expensive language center(for English) in NYC?

Here are the ones in Manhattan. I know nothing about them. Sorry.

http://tinyurl.com/npp4eo

Are you planning on spending a year in the US to study? This organization may be of interest to you. Turkish American Friendship Society

actually i am thinking about 1 -2 months

@panspermia: Your use of written English seems fine to me. IF you need practice speaking, simply talk to everyone. (Keep a notebook and write down every new word you hear. I did that when I was in France, in a town where no one spoke anything but French.)

@gailcalled thank you for your advice..actually i am good at writing in English (may be its not perfect but fine by me) I wanna improve my spoken English..You know one of the best way of learning English is going to motherland of the language