This depends on how long I would have to wait for the sequel... Is it a series? Patience is not one of my virtues :)
It is a series, a trilogy in fact. Book 2 should be ready by 2015. Is that too long?
Do what works best for the story.
Bring it to a satisfying close, but leave some aspects unresolved so it can lead to the next book.
My Eva says she likes a cliffhanger, but I agree with aec04ec....
Thanks for your input, the cliff hanger seems to be what one sees a lot but a gentle teaser of what might be coming creates a curiosity to what might be coming.
That is a great idea to leave them with a teaser!! Everyone will be so anxious to buy the next book!! I am so excited for you!!!
Thank you for your enthusiasm!