Kelley Armstrong's Nadia Stratford series because it is Kelley Armstrong ;)
"Haunting Mr. Darcy" because a good friend of mine has just read it and loved it, and I think I'll love it as well.
"Love in the Light", because I loved Hearts in Darkness. I even bought it in a thin paperback edition...
Act Like it, because most of my friends on Booklikes and Goodreads have been reading it and loving it, so big expectations :D