Flat spiral

Hello,

I have drawn a flat spiral in solidworks 2011 using the curves through XYZ points, after generating the coordinates in excel -> export .txt.

   FLAT SPIRAL

I am satisfied with the result, but it was a pain in my behind to get it fixed like this. Does anyone have a suggestion to draw these forms more simple and faster, because I have to draw these in different dimensions. Or with an other version of Solidworks?

Thanks!

SolidworksSketching