A hoarder too, with ebooks as well as paperbacks !
I buy them by batch, 2 or 3 at a time, sometimes from the same author (part of series for example).
I'm kind of a compulsive for series (trilogies for instance !), when I see the first that seems interesting, I don't wait after reading it to buy the 2 others, I buy them all at once !
Luckily, I'm rarely disappointed...
So, I have plenty of books to read, and I choose one according to my mood...