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I've just purchased this 12v bipolar stepper motor and now I'm looking for an appropriate driver to hook it up to the raspberry pi 2. I'm a little overwhelmed by the specs and choices. Which driver should I go for?

I've seen the ULN2803A but this seems to be only for unipolar stepper motors. The L293D is described in this Adafruit guide, but their motor has five wires and mine has four. Is there a similarly cheap IC I can use for my purpose? Or a more expensive board is fine as long as I can find the right one.

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I'd be looking to buy an A4988 based microstepping driver.

You can pick them up on eBay for less than a UK pound (if you are prepared to wait for delivery).

E.g. http://www.ebay.co.uk/itm/152189401647

Datasheet at http://www.allegromicro.com/en/Products/Motor-Driver-And-Interface-ICs/Bipolar-Stepper-Motor-Drivers/A4988.aspx

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