MSP ADC conversion rate

Hi!

I'm using MSP430i2041 for my project and want to upgrade to MCU which has higher ADC sampling rate, and data memory, but also can do ADC simultaneously at least 4 port just as i2041.

so, I've found MSP430F5x/6x series at ti homepage and that the CLOCK of Sigma-Delta 24 is 1.024 Mhz for best conversion and about 2 Mhz maximum.

My question is

1. Is there MSP which has higher CLOCK rate of Sigma-Delta ADC than 1.024Mhz for accurate ADC result.

2. if not, should i use SAR ADC or lower resolution (ex. SD24 -> SD16) for faster ADC .

please answer me~!

thank you