Thanks for advising that there was already a thread on this topic. I don't know why it didn't show up when I searched. I can readily understand why folks from the Med would have and use Mortar and Pestles. I've done some research now and think I've spotted a nice 7" granite mortar and pestle from a company called Cole & Mason. It has some superb reviews.
It's amazing. There are granite, wood, marble, stainless steel and even glass mortar and pestles and in sizes that would barely hold 1/2 cup.
I figure that what I buy should be heavy, rough on the inside and the grinding end of the pestle. And it should be big enough to allow all manner of things to be placed in it for grinding and mashing up. It should also be easy to clean.