A Japanese-style ryoba hand saw. I'm a hobbyist woodworker, and I didn't believe the hype until I tried one myself. I just have a $30-ish one, and it's like night and day compared to any other hand saw I've used. Having ripping teeth on one side, and crosscut teeth on the other, alone is worth it. Then, you get into how much less force they require and how rarely they bind.