I hear there are quite a few G-Cats in that area. Try to find a G-Cat 5.0M. I think that would be the ideal boat for you and your daughters, as it easily has the room and bouyancy to sail well with all of you aboard. Plus it's a super-simple boat, which helps when it comes to maintenance and repairs.

Otherwise the Prindle is an excellent choice. Around here it would only go for ~$1000 tops, but then it's a buyers market in my area.