With a laid back personality, nice age, great height, registered, and nice color... I wouldn't start his asking price any lower than $2500. I'm in eastern PA, just across the river from NJ. Most of the horses in the $1-2K range around here are either very green, or semi-retired, or a grade trail horse. Just remember, you can always drop his price, but you can't raise it! He's got an adorable face, and a video goes a long way when advertising in this price range.
I've spent most of my life riding horses. The rest I've just wasted.