Howdy, I'm getting to like osage, though I have no chance of harvesting it myself. I really like junipers, especially ERC and its very close relative-Rocky Mountain Juniper. Ipe is a very nice bow wood, It is usually backed, but only because the grain is so difficult to see, that making sure the back is straight grained is almost impossible. I've also trie Ash, slippery elm, hazel, yew, black walnut and hickory can all make great bows
Here is a sinew backed Rocky Mountain Juniper
Here is an unbacked ELB out of Rocky Mountain Juniper
And this one is an osage ELB
Ron