Depending on the area the prices of the bare bones versions like you have (no accessories in SUPER mint condition) dont usually go over $65 tops I have seen loaded ones with cabinets and the stools go for around $100 to $150.
Since the economy tanked I have been buying the cream of the crop machines for little to nothing FWs for $25, My 500A was free, and Darcene made off like a bandit buying me 6 machines in wonderful condition for $15!!
Dont even look to Lisa (Quilt Addict) for prices. She has been finding some super nice hard to come by machines for next to nothing including her Parlor Cabinet she picked up for $50 or less last night.
And the all time best deal was the New York Singer complete for $15 and that is probably the rarest machine to hit this forum.
So I would ask what you feel that is reasonable and go from there. Both machine look really nice and they should sell pretty easily especially the 301 (the better Featherweight :D )
Billy