This has been discussed quite a bit before.

BTC-E has always had lower prices, because it's hard to get money in. Gox has, for the past couple of months, had high prices because it's hard to get money out.

Everyone has a different experience. If you think whatever % you can get sounds good, even if it takes a few months to get your money, then go for it. Of course the price of bitcoins might double in that time, and then you would have been better off just waiting and selling back to wherever you bought them.