Dude, I have both. I never touch PT until I am done with everything production wise. in other words composition, arrangement, conversion to Audio and sometimes VST automation are all done in Live 8, then I import the audio into PT 8 for mixing and mastering later on.
this is the workflow I decided is best after long journey with PT. for production and storing ideas, I recommend staying with Live. if you are interested in PT then get it but just know if you use it for production, your workflow is only getting uncomfortable and uneasy.
it never ends. it doesn't begin where you think it does. because it's only in your mind.