Hi D.,
Everything you say points to your son being ready to learn. I've heard so many horror stories, but potty-training my son took exactly one day, was fun for him (if a little busy for me) and without trauma or any tears...
The secret to make it happen? A book called "Toilet-Training in Less Than a Day" by Nathan Azrin and Richard Foxx (http://www.amazon.com/Toilet-Training-Less-Than-Day/dp/06.... See if your library network has it, I just borrowed it, and boy was I happy I did it. The title is truthful, it does take less than a day. And the book was written in the 70's! I don't get why it's not recommended by all pediatricians.
Several of my friends also used this method, and were very very happy with it. My son was actually an outlier, since he still refused to go potty to poop for 3 weeks after that, but from that day on he would ask for a diaper, do what he needed to do, and ask me to take it off. After 3 weeks, on his own, he just went in the potty and that was the end of diapers during the day (night dryness takes a little longer, but I didn't care about that.)
Have fun with it!
K.