Tronco The PT-40 can be built with 5 or 7 inches of dihedral, I built mine with 3 (some slight mods). The more dihedral the more stable and self recovering the plane will be. As you gain experience the high dihedral may become a bit lazy for you as you will want to do more aerobatic maneuvers. If you do go with the PT-40 or any of the conventional trainers, (See RCkens posts at the top of the forum)
you may want to go with a little less dihedral or a semi symmetrical airfoil, this will keep your trainer fun as long as it lasts. And reading these forums some of these guys will have their trainers forever. I have moved to my low wing trainer and I still take the
PT-40 up for the first flight of the day. And contrary to a misconception that finds it way into these forums, Trainers can do very nice aerobatics and can be a blast to fly.