This would be very helpful for you as you are looking to build a library of high interest novels for Spanish speakers. I got a grant to buy Nooks (like Kindles) and I was actually able to buy 136 titles. I sought help from everywhere to find out what kids might actually read.
This contains those 136 book titles, organized in three different ways - one alphabetically, one by genre, and one by how I organized my library (which books I put on which Nooks, which might be helpful if you are doing the same thing I was). If you are in need of these titles, this list will literally save you hours of work.