regarding the sb700; yes, it is a very good unit with wireless capability (cls). it can tilt slightly downwards for on camera macro work as long as your lens does not get in the way.
for off camera studio work you could pair it up with a reflector.
on the other hand you could look for a pair of sb 600 units for studio work.
the nikon r1 can be used with the d7100 wirelessly without the need or extra expense and bulk of the c1 controller as the d7100 has cls,,,,,, the r1 is rather bulky when fitted to the camera lens but the flash units can be detached (and further units added) for studio work. it a shame it uses oddball batteries though.