Motor for my rail???

Hi

Thanks for the artical, it helped, I would just like to get your opinion and some advice if you don't mind.
I'm getting all my parts to build a rail similar to this one http://motiontimer.com/es/demo/
Now the motor being used on the Dynamic Perception rail will not work for me.
I was looking at these moters:
http://www.servocity.com/html/10_rpm_gear_motor1.html
http://www.servocity.com/html/2_rpm_gear_motor1.html
http://www.servocity.com/html/4_rpm_gear_motor.html
http://za.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0420580#
http://za.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0420570

I am not sure about the rpm and if the motor will work.
Yes I know it's like asking "how long is a pice of string?" but in general use/speed like the one of Dynamic Perception, what motor should I go for do you think.
The last two links would be great if one of them will work because I can get it locally, but if it cant then so be it then I will have to get it from the States.

Your help would be appreciated greatly.
PS: I will be using a rail like in the motion-timer video and the MX controller from DP

Thank you
Joe

Also if you can find a different one that will work I will also appreciate, just one thing, it must be a (non box motor)