My boy is totally a mommy's boy, he follows me around the house and snuggles with me all the time. My boy is VERY alert too, but he never barks for no reason.
When I was picking the puppies, there was three boys and one girl. We knew we wants a boy and we picked the one that is #2 in everything (size, active level, needs for human, "aggression" level when they play).
About potty training, I didn't believe he could be trained until about 20 weeks... but after that, he had huge improvement and by 6 month, I can say he's potty trained. Not sure about females, but I'm happy with my boy's "performance" :P
Congrats on your coming fur baby, you will love him/her!