That is a totally acceptable plan. Either medium brown or reddish brown will look nice, but always be confident of your final results by taking the time to perform a strand test.This is done by mixing equal parts color and developer in a seperate plastic or ceramic bowl, apply this small amount of mix with a q tip to a small section(strand or bunch) of hair. Let this process thirty minutes, shampoo and dry and look and see what color you end up with BEFORE you apply it to your entire head.