Impossible to say. I haven't used any of the printers, but you have only included the cost of toner for one, some printers have no prices and one is priced in sterling. You also need to be aware that the toner supplied by most manufacturers from new is not a full toner but a demo sized, reduced capacity one.
How many pages per month will you need to produce, and budget that way bearing in mind that the fuser units will need replacing at some stage for some printers?