Shimano makes a good cable/housing cutter. Also highly recommended is what we call in POrtland the "pokey tool". just a 14 ga (2.0mm) spoke cut to say 8-10", bent into a handle at one and and a sharpened point at the other. It is used to clean up the cuts and ensure none of the cut housing is digging into the cable. I slip my pokey tool into short pieces of housing stapled to my workbench. Very handy.

Ben