DFB,
Sorry we posted at the same time, But heres a little insite, I talked to TerryinMD and he has the 14" lienbach he pulls with his 4100 (I hope that is right Terry) So I talked to my dealer since he knows where I live and he recommended the Lienbach #19 which is a 12" plow. Whats hard to see is there are a lot of rocks in the soil I turned. I dont think my tractor would of been able to pull the 14" through this soil. The R-4s worked great/w3tcompact/icons/smile.gif The plow was $289.00 and it is built pretty sturdy.
Also here is a pic of my linebach box blade. It made by united implements MFG. Its a 448 HD. Nothing fancy but works great.
Hope this helps, Take care, Jim