Hit.... You were asking about kits and from what you say you are already aware of Sig and Great Planes. Don't forget the little guys like Balsa USA as they (for one) are doing a great job of keeping prices down. Lots of lazer cutters offering sub-kits but it seems they are pretty pricey for what you get. Don't forget to peruse EBAY as well as some old-time kits appear occasionally.