I was originally going to use oak, but a good friend of mine suggested ash. He has a large assortment of wood to choose from. I helped him build his storage rack for his wood around 10 years ago. Wanted to pay for the wood, but he said no. Therefore, I payed it forward and did not charge friend getting the shelf for lumber or labor. However, I did get help from the friend that was getting the shelf. He is not a woodworker, but learned a lot.
PS. All of use know each other and go to the same church.