RE: good .40 size arf
In my opinion, the best flying plane for the money, and I think they are still $69.99, is the World Models Sky Raider Mach II.
[link=http://ecsvr.com/abm/shopexd.asp?id=1958]Mach II[/link]
A lot of guys at my field have flown them with Thunder Tiger .42GPs and LA .40s.