Haha, great :-) Aperture fever starts early.
Explore Scientific also has an 8", but it's currently out of stock at Amazon it seems (and I have no experience with it).
XT8/XT8 plus is usually not worth it, even with the additional accessory kit.
For the planets, you'll need a open view to the south; If that's an issue, you might need to consider portability :-)
Size/Portability /r/telescopes/comments/4ldauj/need_help_identifying_a_good_telescope_to_buy_for/d3mr0xp
As for the mentioned planetary eyepiece, the 6mm gold-line is a great budget solution that will beat any barlow or kit eyepiece. There are sets and cheap 6mm Plössl, but they have horrific eye-relief.
Eyepiece field of view simulation for 8" (and similar focal length) http://blog.pixelgiraffe.com/wp-content/uploads/2016/11/dobson8eyepieces1200.png
https://www.amazon.com/Yuniroom-1-25inch-Eyepiece-Multi-Coated-Telescope/dp/B07NYCTVN6/ref=sr_1_16?keywords=6mm+66+eyepiece&qid=1563224734&s=gateway&sr=8-16 (from China, else $33-$60 from the US)
https://www.ebay.com/itm/New-1-25-Ultra-Wide-Angle-Eyepiece-Lens-6MM-66-Deg-Multi-coated-for-Telescope/132954879600 (There are also the relatively new red SVBONY 1.25"FMC 68°, but I never tried one of those)
...And "Turn left at Orion"- The missing manual :-) While apps show you where stuff is, the book shows you how to use a telescope, what to expect, and just is an amazing read for observing with the naked-eye, binoculars and telescopes. Speaking of, do you have binoculars? Even some small ones can make it easier to get oriented, as telescopes show a pretty small piece of the sky.