The plane we're using (as shown in the following image) is a Bixler from Hobby King. It's actually named after one of the two Joshes (Josh Bixler) from the popular YouTube channel Flite Test:
As you can see, it's very inexpensive. Well under $100, and comes with a motor, and all the servos necessary to fly it. The dihedral curve in the wing makes it uniquely stable for soaring. It also comes with the two halves of the main fuselage separated (making wire routing and component placement very easy). Finally, it's a powered glider. This means it's very efficient, and has the potential to travel great distances under minimal power. This is exactly what we're looking for!