Hi CVNATH,
I assume you are from India and most probably from south india , as such the TENETECH guys are providing the ARMDUINO which is actually OLIMEXINO STM32 and which i like a lot myself so got check it out, these boards the best and they have overtaken the Mega in terms of many things like processor, additional auxiliary facilities like SD card and peripheral contectivity etc in a 40% approx less cost.