Micromax A067
The Micromax Bolt A067 is powered by 1.3GHz dual-core MediaTek MT6571 processor and it comes with 512MB of RAM. The phone has 4GB of internal storage that can be expanded up to 32GB. It packs a 2-megapixel primary camera on the rear and a 0.3-megapixel front
It has a ram of 512 mb ram but runs better than a phone of 1gb ram.
I would recommend you to buy this as it is priced at 4000/- only.
I personally use this phone and it never lags.