Hi there
I would say a reasonable price would be 1700 pounds depending on wheels, seatpost, seat, grips, pedals and lastly wear and tear of the components.
Size is also a matter, 19" and 18" fetches most. The MC1 is also a matter: if it's with rise or not (most sought after) and fairly short approx. 125 mm. and an uncut handlebar naturally.
Cheers Jon and good luck