Kinect
– tracks up to 6 people, including 2 people for full-body motion analysis
– $150

Wii controller + Nunchuk
– tracks 2 hands
– $40+$20 = $60 ($120 for 2 people)

PlayStation Move + Navigation controller
– tracks 2 hands
– $50+$30 = $80 ($160 for 2 people)