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make portable device

hello
 i wanna make a portable device battery powered for real time fft and digital filters.
 i need to low power chip.
 my device use from 4.3 inch tft touch screen for display.
 tms320vc5509 is a good choice for dsp but it have not spi or i2c interface so it need to cpld for matching interface with sensors.
 cycloneIII with 24k LE better than from tms320vc5509?
 please advice me.
 

thank you