Thanks Mel & Mister_e.

For the time being I am not going to dive into the 70 pages guide of the delta sigma.

I will choose option C. why? because I already have experience using ADC 0831 with Basic Stamp2. I will try it today.

For the past three weeks I have learn how to blink Led, servo and serial LCD with PIC. All with the help of forum members and by reading post in this forum.
You guys and gurl (Mel Of course) are superb.

Thanks for the time and effort.