Konrad,
I use a hammer mill to chip corn cobs etc and it depends on the size of the screen how fine the material winds up. You can grind flour, meal , or chunks the size of a quarter if you want. For woodchips maybe look at a DR chipper or something a long those lines because they have ones that can chip 6" diameter branches. My understanding is all chippers struggle with chipping wire like green branches of one years growth. I would pile them and either compost or dry those branches a year and then chip them. Back to straw for a second a bale grinder is used on big cattle ranches here and would turn a 1000 pound bale of straw into chopped straw in minutes.

Depending on how much your wanting to do you might consider a bale buster or something like that.

Here is a link that might be useful: Hay buster

As far as wood chipping goes a DR chipper is a good wood chipper. The bale buster and wood chippers could somewhat be used for the others purpose but they are unique pieces of equipment and it would be best to keep them that way. A jack of all trades if it's a person or equipment is a master of none.

Here is a link that might be useful: DR chipper

Thank you Clarkin,...that bale buster would be too commercial,...chipper shredder around 10-15 horse power I'm thinking but has anyone here used it for straw?

Didn't think it would to this.....
Want something cutting, not coughing.

Here is a link that might be useful: DR Chipper Shredder

Seems like you want a leaf mulcher/shredder. I had one that I loved for reducing leaves to mulch (after about 5 years it burned out on a hidden stick). Mine was a Sears, and they no longer market it, but there are several brands on Amazon and I think that Harbor Freight also sells one.

Here is a link that might be useful: mulchers on Amazon

No...these work on the principle of whacking, not cutting.