I started traveling again for business (and some personal adventures) about three months ago. Like you, I wanted an improved device that would be good at pretty much everything and VERY good at playing media. I decided on the Fire HD 10. It was right at $150 with a temporary discount (I’m Prime) but with NO special offers (hate 'em).
I love it. The picture is gorgeous.
Pros: It accepts micro SD cards now and I keep a 64GB in it for videos, with a spare 32GB loaded with music. It connects to my laptops very quickly as a drive. Battery life is very good…6-7 hours playing HD movies and using earphones. It’s responsive and overall quality is great. A big plus is that there’s a gazillion cases and accessories for it.
Cons: It’s tricky to do some things in the Amazon version of Android. You can easily side-load Google Play and other apps, but it’s strangely reluctant to let you control things like apps updating automatically. They also removed the MiraCast feature from the most recent generation. Plus, the Silk browser is kind of annoying.
Overall, I’d give it 4 stars out of 5.