Tex is a real time-saver, and a helpful lad; I don't have to take time to answer.
An unbiased answer... this lot of Sidamo is very good, and since it'll keep well in storage, you may want to take 10#, just to bring the per lb. shipping cost down. But in that regard, you may as well throw 5# of Costa Rica in the box. Take w/ a grain of salt.
Typically, I can ship the day after an order is placed. Depending on where you live and the distance from Lake Cheddar, you could be roasting in a few days.