Hello...Which microcontroller you should buy very much depends on what you are trying to do with it.Do you actually need a 180MHz M4 with LCD and SDRAM controller?If you don't need a lot of processing power your may also want to consider the less complex Cortex M0+ products. (eg. STM32L0, ATSAMD21, LPC8xx etc) ST, Atmel and NXP all have cheap and readily available eval boards and software tools available.
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