The specificatin of ballscews?

Could you give me some suggestion about the choice of ballscrews?
I would lilke to build a 4'x 2' Z:10" router for woodworking.
Which one would be the best choice for my router?
I try to get the price from these company

http://www.comtop.com.tw/index-2.html

They are famous in Taiwan and manufacture them in good quality with
cheap price----someone say that!
but they need to know the detail dimension and part number which I
would like to use to calculate the price.


Too many types of ballscrews to make a choice.
Hope someone kindly tell me his/her experience!!

Cheers!!

Tom