Brother, If you are looking for immediate cooling and less billing then you are supposed to go for big brands, if you are much comfortable with budget you can simply go for Daikin, General, Panasonic, Lg, etc.
But in case you are tight with budget you should look for local brands like Dawlance, Pel, Gree, Haier, Kenwood, Personally i believe Gree is most overrated brand, Rest, Choice is yours