I'm building a cross country plane and need help with selecting a proper wing.

The lower the drag the better. I'm thinking something like a trainer wing (probably higher drag), because of dihedral and self leveling properties. This makes it much easier to fly the long distance (100 miles). I know there probably isn't the perfect wing with everything I want, I will need to compromise in some areas.

I'm thinking a wing in the 60" wing length, and maybe 11" to 12" cord depth. My questions are do I gain anything by shortening the wing and increasing cord? Is there less drag by lengthening the wing and decreasing the cord. Is a flat bottom the best way to go.

I'm guessing this will end up being a 6-7 pound airplane, with 90 oz of fuel on board. Haven't decided on motor yet, will either be a Supertigre .75 or maybe a Saito 100. Depends on which one would be more fuel efficient.