S.B.
Take a look in January - Parenthesis usually holds a pre-school open house that showcases pre-schools in the area. You can enroll in some when kids are 2, so your son could go next year if you wanted. I've heard of lots of good pre-schools, and there are waiting lists if you don't get signed up right away. (Again, usually Jan/Feb, depending on the school.)
All 3 of our kids went to the Academy of Arts & Movement. Montessori, combined with creative movement. The teachers there are great, and very caring. All of my kids, despite their differing personalities, loved it. (All of my kids started there when they were 2.) We've been there since 2001, and this will be our last year this year.