For RC paper, both RA4 and B&W I have found that the cheaper tray type dryers as opposed to the roller dryers are very effective for normal amount of prints.
RA4 prints seem to dry especially quickly with just the fan circulating the air as opposed to the heating element.
If you can wait for about an hour or so then Paterson drying racks will fit the bill even more cheaply.
The heated roller dryers have a tremendous throughput but also a tremendous cost.