If your heart is set on the GB, you may fall in love with this one. If the price is not a problem. Comparing to others big planes this is rigth on the money.
http://www.composite-arf.com.hk/ar/Product?411000
I saw one on the working table of my friend's Larry Tudor (C-arf rep). Belive me this plane is aweson! He is building one for a customer.
Alex