It would help to know where you're going and what your current set of gear is. My guess is that you'll get lots of helpful advice about your destination, and a lot of tips on how to lighten your load/upgrade equipment.

Regarding equipment, I'd offer one general thought. If you've been using what you've got for a while, and it's not worn out, don't rush to change your gear. You say you have significant experience, so clearly what you have works for you and you don't find it horribly burdensome to carry - so there's no compelling reason to change it out.

Having said that, I won't deny that trying out new gear is a pleasure all its own - I'm not sure a 6 or 8 day trip is the time to do it.