Which interval timer for E30?

Hi all,

I'd like to get an interval timer for my E-30. The use would be to capture a series of timed exposure either for creating a time-lapse movie or else for stacking astrophotos (or both). I see various models available, wired and wireless, from about 3 € to over 100 €. Which models work well?

Many thanks.

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Mark
my gallery: http://www.dpreview.com/galleries/5120988127/albums