Shawn, I have a 4" hole saw. It requires a beefy 1/2" drill motor to turn it, and you need a second handle on the drill to control it. The 1/2" hole would be easiest with a Forstner bit. Simply mark a line on the bit 1/4" from the end of the teeth and stop drilling when you reach it. If you had a plunge router you could use a 1/2" plunge bit and simply plunge in the 1/4" depth.
"Living in the D" (this means Detroit!)
"It's fine to disagree with other members as long as you respect their opinions"