I wish I knew the area but here are some general suggestions.
1) May a list of what is working in his current program and get a printout of the. Scope and Sequence of his current school grade. Siit in the classroom he is in now and observe. If an additional skip is needed get it now so you can walk into the new school with documentation that he belongs in X grade.
2) Talk to all the potential schools and sit in their 2nd grade classrooms. Observe the teachers the students and the materials. Don't believe anything the admins say unless they are describing accomidations currently being offered to other real students. Find out how much time the gifted programs meet per week. Are the kids expected to make up below level work that occurs while they are at the pull out? Do teachers. Schedule parties or hands on experiences during pull out time.
Schools that are great for bright kids may be dreadful for giifted kis...schools that are great for gifted kids may be dreadful for EG kids. Schools that are great for some EG kids may be dreadful for other EG kids. Rent in the begining....join every geographical gifted group you can....visit schools that understand respect for diversity on a deep level and are committed to meeting each childs individual needs. Trust your gut.
Love and more love
Grinity
