I think $125 is reasonable but picked all my 401s and 403s up for around $60 each 2 years ago. Not sure I would pay $160.
The cabinets and machines are pretty easy to come by and the accessories really dont have much extra value for the 401s although the monogram cams and professional buttonholer might be worth having.
The 401 cabinet will take a cradle for a 301.
I love my 401s.