M246 has warranty for another 18 or so months. It's mint, with full box set.
50Lux has warranty for another 16 or so months. It's mint, with full box set.
50APO is just front filter and rear cap only.
75APO is full box set, no warranty.
M246 + (spare battery) - $5,800
50Lux - $2,700
50APO - 4,900
75APO - $2,600