If necessary you might be able to fix the magnetic stirrer because they can be fairly simple devices. Some just use fans with magnets on or some similar method to turn the magnets.
The SilverTron Elite does not include a stirrer of any kind but does have outputs so that one can be connected. You have to choose which kind you require. You could get a stir late or even hotplate stirrer. I gather you can connect a bubbler/aeration device. It does look very versatile but it is more expensive in comparison to other units.