Have you tried the June Tailor Shape Cut mat for cutting strips? That is my favorite. There are several different ones. This is the one I use the most:
http://www.amazon.com/June-Tailor-Sh...dp/B000YZ7SJM/
It has slots every half inch.
The Fiskars cutter Karen mentioned was discontinued but is supposed to come back. It is similar to the one in this link except twice as long:
http://www.amazon.com/Fiskars-12-Inc...dp/B001CE38Z2/