Decision Made! After talking it over with my son (age 14) - we are going with the dog in the first picture. Her name will be Lucy! She was our first pick - even when she was only days old. She was supposed to be a little bigger (which we wanted) and her Mom was the more laid back of the two Mom's. Now, I know that's no guarantee - but that's all we had to go on at the time. We have a hyper Westie - so more 'laid back' sounded real good at the time!
My son has never waivered - ever. When we went to see them at 6 weeks; we found out she wasn't going to be as big as what we originally thought and the breeder showed me another one - (second pic); who will be about 1 lb bigger. Lucy seemed a little more timid - but the breeder advised she had never been out of her room with her Mom (only 2 pups in her litter) and suddenly she was in the room with the other Mom's pups and some strangers and a little scared and I was not getting to see her true personality. She did, however, climb right up in my son's lap and sleep for most of the visit.
So, he fell in love all over again. Since Ringo (our male Westie who was supposed to be Matt's dog) seems to love my lap . . maybe Lucy will be the one to cuddle up with my son and be the perfect addition to our family.
Thanks for all your advice! I'll be back at the end of the month with pictures! And I'll be reading and reading the old threads for info before that.