Get a Giant Scales Planes/ Chief Aircraft Katana, it meets all your criteria even the price is not far off. The airframe is a 72" WS and weighs only 5 pounds. For 3D put a two stroke glow engine and probably mount the servos near the CG not the tail (avoid adding lead in the nose). Best of all it looks cool similar to an extra or edge but has that unique shaped wing (which also helps slow speed characteristcs) and most important again looks cool. Click on my photo gallery button below to see pics of mine w/ Saito 180 it now has an RCS 180 gasser (too heavy for your application).