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? http://www.aliexpress.com/product-gs/517614158-NEMA17-78-Oz-in-CNC-stepper-motor-stepping-motor-1-8A-wholesalers.html

or this http://www.aliexpress.com/product-fm/518917089-DC-Gear-Stepper-Step-Motor-with-ULN2003-Driver-Board-5V-4-Phase-28YBJ-48-090055-wholesalers.html

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

Thanks,

Hi

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