Get a good 2x barlow and a combination cheshire collimation tool.
Although it really depends on what you want to look at?
With a bit of a lull coming up in visual for planets, you'll probably go hunting for deep sky objects (DSO)s. You might not need the barlow for a while.
What focal length and f ratio is your new 6 inch scope?
Do you have a planisphere or star charts?
Take a little time to get acquainted with the sky and stars.
Enjoy
