Cheap dual core mcu for a data logger?

Hi all!

I'm thinking of creating a simple datalogger that prints out the characters onto a sdcard/USB device.

I would like to be able to poll data, save it in a buffer and simultaneously write it to a txt. file. If I just choose an ordinary stm32 cortex mcu and jump back and forth between the different processes eventually either the buffer (flash memory) will run out since I can't fully write as a continuous flow is coming, or I will miss data during the write to usb/sdcard section since the MCU is busy doing that. 

So I tought a dual core mcu would solve this problem. One core samples data and fills the buffer, the other core writes to usb/sdcard from the buffer. 

Question is, what are the best/cheapest options available? 

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