I have been using lenovo A319 mobile for last two year , it is one of the best smart phones at low cost having very loudable audio system with Dolby feauture suitable for music lovers and very fast touch and high speed rate with good battery life for one day backup at one time fully charging.
This mobile having 4 GB ROM and 512 mb RAM , Provided with dual sim slot facility and one external SD card slot, so that we can use external memory based on our wish, though it may be best it is having low quality camera only suitable for day shoot , finally it is a best mobile at low price.