The H-9 EDGE is a 1 piece wing! It is a nice flyer though. Creek Hobbies puts out a nice Extra but again it's a 1 piece wing.
Stick with the 4 strokes! If you use the Saito 180 or YS-140 you can fly up to 14# and still have decent 3D capability.
Try an Aeroworks 29% Edge ARF. Pricey but light. I'm working on a 31% and may have it under 16# (92" span!).

The 2 piece wing is the kicker! Yellows are 1 piece, SIG's are 1 piece. Look at Bubba Spivey's line "Lanier".