Depends how happy you wanna make her. :-)
Good point.
Pukin Dog....If you have to think that much about spending the money on her...this relationship is not in good shape or this is so casual that maybe just a box of chocolates and a pretty sweater would be more appropriate.
If buying the present is about what you'll get for the holiday...Here's another way to calculate the " $ " spent...if that is the issue.
Figure out the price of the Mixer, divide that by 3 and see if that is what you would pay a call girl for 3 visits.
Good luck!