Since the MSP432 (and, AFAIK neither the TM4C) would fulfill your requirements directly, you could either go for a discrete solution (external ADC's/DAC's), or switch to another MCU vendor. Not wanna advertise here: the STM32F3 family is geared towards analog processing, and has MCUs with the number of ADC/DAC units you want. However, the higher resolution ADC are sigma-delta, and not SAR. And the software framework provided ("CubeMX") is actually a mess, with no "cure" in sight ... BTW, I would investigate both options. External components are not necessarily more expensive than integrated one's, and you can tailor them according to your needs (price, accuracy, speed, bus interface, etc.).
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