I have seen a lot of Bitcoin exchanges, BTC-e, Coinbase, Bitstamp, LocalBitcoins and Bitfinex. (I saw those on blockchain.info) But which one of them is the real bitcoin value?
There is no such thing as a the "real" value.
The value of Bitcoin as denoted in another currency (USD, EUR, etc...) is based on how many people are buying and selling, and in what quantities. On different exchanges, there are different numbers of people buying and selling different amounts of bitcoin. Each exchange calculates its current posted value based on the quantity and amount of the bid and ask orders currently on the exchange. The results will be different from exchange to exchange, because people are buying and selling differently on these exchanges.