Great Plains. I have used Hay Buster a few times, but they break and don't have front colters before openers. I have a Great Plains NT606 (all I could afford) dirll with small seed option, just used it to do 30 acres using Bahia seed and brown top millet. The dirlls are pretty much the same design for 6ft to I think 13ft wide.
The great plains has alot of features, and adjustment to taylor the dirll to the seed and conditions your using and in. I really love the calabartion feature, lets you calabrate the drill for how many lbs per acre of seed before you ever go to feild. Takes all the guess work out of it. Anyway, I like it, pricey new, and hard to find used, was for me anyway, but works for me. I spent all day driving over to Tupelo MS to get mine, closest one I could find.