Advice on stepper motor

Could some1 with some acknowledgment of these stepper motor give me some advice of what kind I should order, should I go for unipolar or bipolar?

I do know that for a unipolar I need to get a Darlington Transistor Array and for a bipolar I need some H-bridges.

What do you think of this one?

or this

Edit: I dont know if its allowed to post links, if its not please tell me



What do you plan to use them for? And in what situations/environment?

Cheers ! Geoff

Thanks for the reply!

Im going to use it for a frameless laserharp, so it will have to rotate fast ofcourse :P