Suggestions

Hi am new to this forum.

I have expereice in firmware develoment for different micro controllers and processors. Now on my personal interest, would lke to learn and start working on ARM thumb processors with RTOS porting. exploring on reatime OS.

I have couple of questions. :?:

1]which is the best processor to begin.

2]I have seen LPC p 2106. is it like a simple controller or can we use any RTOS ? sorry for not going through the documentation? or any LPC2XXX

3] how about AT91SAM7S64? comparing to LPCP2106?

4]I would like to buy these from OLIMEX/sparkfun?? :!:

Your suggestions are more valuable. Appreciate your help.

Thanks.