I use something like wheat, rape, and crimson clover. Really depends on how much sun though, I like seven top or purple top turnips in a no till mix too. Most commercial mixes will be close to this except they will usually have a annual ryegrass in place of wheat. Commercial mixes will have berseem clover too alot of times. Im good with annual ryegrass in some situations but many will discourage you from using that for a variety of reasons... If you look at the labels of some of the buck on bag products you can see what is in them and the percentages of each.