How many of those have you read?
I own...
The Lord of the Rings trilogy
The Hobbit
Unfinished Tales
The Book of Lost Tales part 1
The Book of Lost Tales part 2
The Lays of Beleriand
The Shaping of Middle-Earth
The Children of Hurin
The Silmarillion
As for those I've read...
I've read the main trilogy about 10 times (I read it once a year) and the Hobbit many times. I've read parts of Unfinished Tales and the Silmarillion. I haven't started any of the History of Middle Earth books, though I certainly will sometime soon. The Children of Hurin is a recent acquisition (I got it for my birthday, which was about a month ago) and I'll read that soon too. There's so much to read...

I realise this topic may not strictly belong in this forum, but I see not more suitable place for it.