Whatcha plan on painting it with? The first thing that springs to mind is if you are painting it use the dirt cheapest wood you can find that satisfies the structural requirements. Why spend money on beautiful grain patterns if you plan on covering it? MDF may be the way to go.
I used MDF on my last stand build....the main thing is, the coverings dont supply the strength....so, they can be as light or thick/heavy as you like...