> Anybody have a favorite circuit you'd recommend?

Roman Black's convertor may do you

http://www.romanblack.com/smps/conv.htm

You'd have to cut it back to 11-ishV for 3 white LEDs

Many established companies make white LED drivers,
for lighting, displays, mobile phones etc

eg Maxim have a new one in just about every newsletter

http://www.maxim-ic.com/appnotes.cfm/appnote_number/3256

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