Thanks for your input everyone.
I now have my heart set on a Kobo Glo HD.
It seems to tick all the boxes for me.
Now the only issue is availability in this country...
Edit:
So I have discovered that the Glo HD has been discontinued!!!
The only Kobo devices available in my country are the:
Kobo Aura H20
Kobo Aura One
The Kobo Aura Edition 2, which is supposedly what you are supposed to purchase now the Glo HD is discontinued, is out of stock everywhere... perhaps never to be in stock again... and besides, it's only 212ppi.
The Aura H20 is 265ppi, a bit better... but is 6.8" which is a bit larger than I wanted.
I really want something light and easy to hold in one hand, and I'm not convinced by the Aura H20... I also have no need for waterproofing... and lastly, the price at R2999 is about R400 over what I would consider the limit of 'budget'.
*sigh*
Back to the drawing board.