Ipad
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Apple 9.7" iPad 6th Generation, 32GB, Wi-Fi Only
search: review Apple 9.7” iPad 6th Generation
amazon.com/Apple-Generation-12 Apple 9.7" iPad (6th Generation, 32GB, Wi-Fi Only, Gold)
mobileread.com/forums Post by ilovejedd
You mentioned you preferred Android but thought I'd point out that your budget allows for an iPad. iPad 6th gen (2018) $329 Apple Pencil $ 99 Logitech K380 Bluetooth Keyboard $20-30 Total: $450-460 before taxes, case and apps Yes, the Apple Pencil is pricey but it's one of the nicer ones I've used.
MyScript Nebo
paperlessmovement.com/product Nebo
macworld.com/article The best note-taking apps for the iPad and Apple Pencil By Leif Johnson
With the Apple Pencil, writing by hand feels cool again.
the-gadgeteer.com/2018/05/14 Nebo by MyScript makes my iPad feel like my long-lost Newton By Smythe Richbourg
imore.com/best Best note-taking apps for iPad and Apple Pencil in 2018
Apple 9.7" iPad 6th Generation, 32GB, Wi-Fi Only
search: review Apple 9.7” iPad 6th Generation
Book Readers
mobileread - Apple Devices - Ipad pro blues post by pwalker8
For the most part, iBook (and soon to be Books) is iCloud oriented, so the preferred way is to upload via the iBook app on your mac, then let it sync up via iCloud. Not my favorite way to do it by any stretch. I use Calibre Companion, download my books into that, then open it up in my book app (I use Marvin and GoodReader) on the iPad.
mobileread - Apple Devices - Ipad pro blues post by AnemicOak
Same, except I use MapleRead instead of Marvin…
wikipedia.org Comparison of iOS e-reader software
appstafarian.com Appstafarian Marvin
blog.the-ebook-reader 10 Best iOS Reading Apps for iPads and iPhones
Goodreader
maplepop.com/web MapleRead - iOS ebook reader and server
There are 3 editions, SE, CE and CX. SE: iPad and iPhone, EPUB+PDF reader+server CE: iPad only, EPUB readerResearch
macworld.co.uk/feature Best iPad apps for Apple Pencil
Some good apps here.creativebloq.com/software 13 iPad Pro apps that come alive with Apple Pencil
See Apple ID in pw
itunes.apple.com/us MapleRead SE
Calibre Companion
itunes.apple.com Gerty - eBook reader for epub, journal, notes, photos and maps 4+ by Appstafarian
itunes.apple.com Marvin Classic - eBook reader for epub
itunes.apple.com Kobo Reader
itunes.apple.com MyScript Nebo