Have you thought about buying a small, mines 2400 bushel, regular grain bin. Pour concrete floor, build wooden cribs inside with corn chutes, and having space inside for several cribs? Has worked fine for me for several years. You could finish a new bin for what say 4 of the bulk bins your looking at. And still have storage.
I have 3 cribs in my bin, each hold around 5 ton of feed, and have only used up half of the space. Problem with bulk bins is you only have one feed on hand.
If you're handy you could buy small unused grain bins, dissasmible , and put up at your place. May be able to buy for the removable cost. JUst a thought. gs