If you want to use spices use the 3711 yeast as it is fairly clean and will let the spices stand out, I just did a rosemary and Sage saison that turned out spectacular, the key with spices it to go LIGHT I'm talking whatever you think is light scale it back from there. I used less than a tenth of an ounce of spices and they still came through but not at all overpowering as you still want the yeast character to punch through