if it is so important, why don't you give us some details on what exactly you are trying to accomplish? different buildings work better for different play styles.
But only on lowland. Highlands, you need all Spy defense towers, because while your stables make you invincible to attacks, you have a gaping hole in your spies.
Make Balanced Buildings Higher Total Stats Attack buildings have higher Attack but leave you Open to Attack and Defense Buildings have 5% more plunder but have VERY low Attack and make it harder to Attack Epic Battles so I Suggest Circle if elements
Good point cole with stables and towers everywhere you'll be completely invincible. Like spragga and Chuck Norris combined.