Thank you so much for a well-researched and well-thought-out answer! And just so you know, I'm well aware that neither the size nor spacing would be to scale (I schooled someone on Amazon about this actually), I just want each planet to LOOK accurate.
I did see all of those on Etsy, and I saw the PB one as well. I was really really hoping for a 3D version of this but alas, it just must not exist. Of course that 3D printing solution would be SO perfect but damn, at 20 dollars or more per planet that's just not going to happen. :( I guess that would be why it doesn't exist.
I also found this one but it's not terribly vibrant and Saturn is especially lacking.
Again, thank you!