Hey Icebob,
I bought a 2hp stealth last year and love it. I live in central PA and get about the same ice thickness as you do. The stealth blades and head really cut smooth. You don't need any weight on the auger it will actually pull itself throught the ice. You will not need the 3hp at all. Save your back and get the 2hp-plenty of power. Just remember to retighten the allen screw on the power head or use some threadlock. The Jiffy's do have a higher RPM than the strikemaster and the auger moves alot faster. This is the only downfall of the Jiffy, make sure you have water proof pants on because it really throws the ice on your legs. Good luck