Aren't you looking towards Samsung low end Android based models? Such as Samsung Galaxy Y Duos Lite and Galaxy Pocket.
Their screen sizes are small than the one Micromax you looking at but interface and entire usage experience would be far better than your A-57.
Recently my Colleague had bought Micromax A100 phone it's working fine. However if you compare it with Samsung, Sony or HTC devices you will notice the vast difference in between.
refer to my Mobile Buying Guide. You'll know. And another important point is, check if the mobile have any custom rom. Desi mobiles rarely get community support so any custom rom will be of extreme use as it'll be free of bloatware and have almost full internal memory (200MB doesn't mean full 200MB. sometimes it is 120-130MB rest occupied with crap apps that you can't remove). Not to mention better battery life sometimes. A custom rom voids warranty but one can flash the original rom back in case of any small defect with the mobile and want to seek warranty.