I've had a barley crusher--don't go there!--and currently have a Monster Mill III that's motorized (outside your budget parameters).
If I were to get a mill in or around your price range, the Cereal Killer would be my choice. At $99, you even have some room to look at motorizing it, which is actually very cool. You can get a drill from Harbor Freight or something similar, but there are other motor options as well.
And at that price point, with a drill to motorize it, there's enough money left to build a rolling cabinet or other piece of "furniture" that fits your space. One of the coolest things about my MM3 is that it sits there, ready to go, all I need to do is put a bucket under it, turn on the switch, and in goes the grain. No setup, no taking off a shelf, setting up a drill, or any of that stuff.
So if it were me--and all this depends on what's most important to you--I'd be all over a cereal killer, some way to motorize it, and use the balance to build something to permanently mount both.
*************
If you want an easy way to make a rolling cabinet, start with a furniture dolly which you can get at any home story. Hard to even buy the casters for what those things cost.
