Shaun
http://www.rcgroups.com/forums/showthread.php?t=524948
Go to post #4 the red and white plane is old reliable with 2820/10
Remember you will seldom use 31 amps, my best guess is 10 amps average, this plane flies for 20 to 30 minutes per charge.
Also if it was me converting LT25 I might also look at the AXI 2826/10 on 3S with 13x8 prop, I don't own this motor but think this may be used more now in a 3S world.
Tony