I use the UR #3's on those birdhouses. Danny, do you have a Home Depot near? They carry 2"x2" Cedar. That's what I use. Cuts, and finishes much nicer that Poplar. My opinion, anyhow. LOL! But, be sure to wear a mask. Cedar is bad for the lungs. I use the fan/filter set-up, a mask, and use the shop vac after cutting.
Paul