I did a quick search for SS brake lines for the new 2008 ninja 250R (zx250r) and found that Galfer actually makes them. On my old 2002 250r, brake fade was extremely annoying and down right dangerous at times.

Galfer part number:
Front Line: FK003D674
Rear Line: FK003D674R

I just won these off of 2fiddy.com :D
Can't wait for them to come in

Oh please do post a report.... :fingersx