Homebrew PCBs

Hello,

I am making a board using the toner transfer method, using the Staples 
471861 glossy paper.  I am laying this out with the EagleCAD 
application. 

What I am wondering is what kind of trace width I can reasonably 
expect to be able to render with acceptable results.  I'm probably 
looking at about 25 or 50 mils right now, and would appreciate any 
input into what widths you are able to go down to using the 
paper/toner transfer method.

Thanks,

Mike