The screen I am currently using is a Lilliput 669. It has been replaced by 665
I am getting a sample screen from the manufactorer next week. Both are listed as 250 mcd, but in my opinion they are bright enough for outdoor use.
Is is a quite pricey screen, but the quality is excellent.
http://lilliputweb.net/665-o.htmlThis one is also interesting for the FPV crowd:
http://lilliputweb.net/339-w-221.html