I completely agree, it's about what your planting and what your planting into. I couldn't have planted the 16 acres of clover, I planted into sod with my conventional drill. I've had alot of success planting rye/ oats/ peas, etc. into clover with my conventional drill.
I often wonder how much a partial modification would give you? Say just row cleaners? It won't obviously give you a no till drill, but you'd think it could help? Maybe it won't cut corn stalks and sod like butter, but maybe help get some better soil contact?