I would personally go for the ray gun, because it gives you a whole new character. Witch Marge is a cool skin and is useful, but she's not a new character, she's a costume for an existing character. ...
Witch Marge is one of the better skins, but having a separate character adds more $$ in the long run.
The Speed up Crops task is only worth it if you use 4 hour tasks a lot. It only takes 4 hours off the crop, so you'd get Silvertongue in 4 hours, Moonshine in 20 hours (unless you use it more than once). If you went extreme and did it every 4 hours for 45 days you'd have corn.
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