I believe Edison, SliceX and FL Slicer are the best soft-choppers (software chopping tools) out here right now.
Audacity is also cool and SoundForge 6 at one point was cool just before FL finally came with Edison.
For anyone needing help with sampling/chopping/triggering in FL Studio check out SampleSimple on YouTube YouTube - Chaîne de SampleSimple - there's a variety of FL Sampling videos on there.