
RAZOR SAW, NO DOUBT. These things are amazing at cutting all wood, from balsa to ply sheets, and anywhere in-between. They also cut through plastic, brass and nylon tubes. And works beautifully for cutting both soft and hard tri-stock. I highly recommend them.
As you can see here, they have many to choose from:
[link=http://www2.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=razor+saw&FVPROFIL=++&search3=Go]CLICK HERE ON THIS LINK to take you to a wide variety of Razor Saws[/link]
For precision cuts in wood I highly recommend a simple jigsaw. You have to drill a starter hole but from then on it works wonders. Mine burned out and I can not wait to replace it. I used it constantly on my kits to cut ply. And you can get them for as little as $15 or less.