Cost to build a 12 x 20 deck?

The deck I want to build would be free standing, use pressure treated pine. At it's lowest point it would be inches off the ground, and at it highest point about 2 feet off the ground. The high end would have a 4 foot wide staircase. I want to use 4 x 4 posts, 2 x 6 framing with a spacing of 12 inches between joists. Handrail will be basic and want to use simple beveled end ballisters. All work will be done by myself. What is the approximate amount I will spend (ballpark figure)? I live in the Cincinnati, OH area.