I need to purchase an evaluation board for hooking up the ARM M4 Core. I saw 3 options for STM32F4 - Discovery / Evaluation / IAR. I am not targetting a particular application or interested in a particular peripheral. I like the fact that IAR tools are supported for STM32F4. I need to weigh between the availability and cost and decide on buying 1 or 2 boards. Can someone recommend me the right board or help me decide on the same?