Happy Endings, Closure, & Cliff Hangers...

I like happy endings in a book. I want the hero to come out on top and the bad guy to find justice. (or Karma...that's sometimes as good as justice) I also want closure in a book. Tie up the loose ends and finish all parts of the story. I try to do this in my stories and I hope my readers think so.

I also like to leave them looking for the next book. Just a little whisper in the last page that lets them know part of the story lives on. Not in the way a serial would do it, but more like one or two of the characters coming together to form the a totally separate story.

Sometimes I wonder if I'm torturing the reader by doing this, but maybe its just the writer wondering...what if?

In Betrayed by an Angel, one of the angels is reminded by the higher ups that his work isn't quite finished and the last page is that scene. The the book ends. I've started that next story but haven't finished it. Will my readers get mad if I'm slow to the gate with that next book? I'm not sure. I haven't really given enough information to explain the next book, but just a little tease.

Do you make sure all story lines within your story are closed? Do you always have a happy ending? Or do you end with a teaser?

Updating Book Cover

After reading a few articles about book covers and how people interested in certain genres look for certain types of art on the cover I thought it was time for a change.
On my first cover for Betrayed by an Angel I couldn't find a decent angel photo that hadn't already been used or didn't look goofey, so I went with a photo of a sunset that I took in Key West.
After reading about the importance of book covers I found a cover designer who changed the look of my cover.

From this:

 To this:

I told her there was a scene in the book where the they were on the beach and there was lightening and a few other things and this is what she sent back to me.

I think it works. Kissing couple = romance and beach and lightening maybe give a hint of a threat? Either way I'm happy. 

Now I'm curious to see if it makes any difference in sales....

Which would you buy???

Kindle? Sony Reader? Nook?
I'm thinking of purchasing one of these, but I'm not sure which is better and why?
I want light weight. I want to be able to read in sunlight. I want a lot of books.
Anyone have one of these toys? Why did you choose it and how do you like it?