Getting back to the original question, the JPS labs cables are great at increasing a soundstage, because they highlight the top end a bit more than others. They could be an issue if your system is on the brighter side though. The Shunyatas have very defined imaging, but won't give you any more perceived soundstage depth or width, because they're pretty 'thick' (but not necessarily slow) in the mids. Purist is great if you have a system that is very revealing up-top, and you'd like a more 'organic' sound.
Without knowing how your system sounds, that's about all I can add.
Without knowing how your system sounds, that's about all I can add.