RAMPS will struggle to drive all of those motors near to their maximum torque, because the plug-in drivers have far too little PCB area to keep the chips cool. The 17HS19-1684S1 motor is a very popular one, but most people using RAMPS run it at 50 to 65% of its rated current, partly to avoid overheating the drivers, and partly because setting the current properly on those drivers is so difficult. OTOH if you use a modern board with on-board drivers and software-settable current, such as Duet or Smoothieboard, the drivers are much better cooled and you can run the motors much closer to their rated current (best to limit them to 85% or so of rated current so they don't get too hot).
So if the 48Ncm torque recommendation is based on using RAMPS with motors rated at 1.7A or greater, then the 17HS19-1684S1 used with more modern electronics with the currents accurately set should be more than adequate. In fact that motor is overkill for most small printer designs. I don't know the C-Bot design, but unless it has a particularly heavy print head (e.g. because you are mounting 3 or 4 extruder drive motors on it), I would have thought it should be adequate. All the same, I suggest you ask the designer why he specifies 48Ncm and what proportion of rated current he runs the motors at.
The 17HS19-2004S1 is even less well suited to RAMPS because of its higher current requirement. The 17HS24-0644S is unsuitable because of its high voltage requirement.
DRV8825 drivers can take a little more current than the A4988, but they have some well-documented problems with some types of motor.
One area where high motor torque really is needed is if you insist on using non-geared extruder drives. OTOH an extruder with gearing of 3:1 or 5:1 needs only about 20Ncm of motor torque.
So if the 48Ncm torque recommendation is based on using RAMPS with motors rated at 1.7A or greater, then the 17HS19-1684S1 used with more modern electronics with the currents accurately set should be more than adequate. In fact that motor is overkill for most small printer designs. I don't know the C-Bot design, but unless it has a particularly heavy print head (e.g. because you are mounting 3 or 4 extruder drive motors on it), I would have thought it should be adequate. All the same, I suggest you ask the designer why he specifies 48Ncm and what proportion of rated current he runs the motors at.
The 17HS19-2004S1 is even less well suited to RAMPS because of its higher current requirement. The 17HS24-0644S is unsuitable because of its high voltage requirement.
DRV8825 drivers can take a little more current than the A4988, but they have some well-documented problems with some types of motor.
One area where high motor torque really is needed is if you insist on using non-geared extruder drives. OTOH an extruder with gearing of 3:1 or 5:1 needs only about 20Ncm of motor torque.