Low on books

Last night I noticed I have just one book left on my TBR pile. Yikes! *hits panic button* Okay, I'm still halfway through Angela Knight's Master of the Moon, but I don't like to be "low" on books. So I'm ready to place an order of books with Barnes and Nobles in two days. I went by my BN's wish list. I've got two new Star Wars books in it. Oh, and there's the latest Kasey Michaels's book in the Maggie series (Maggie with a Clue) in paperback out. *vbg* And I can't forget also the latest vampire romance from Charlaine Harris in her Sookie Stackhouse series. In terms of novels, that pretty much rounds up my selection. Now I'd like to buy a book about writing. (Although I haven't touched Writing a Romance Novel for Dummies by Leslie Wainger since January. Maybe I should make an effort and finish reading it.) During the RD's Mentor/Apprentice program, Briana suggested me Writing the Breakout Novel Workbook by Donald Maass, while Lynn swears by First Draft in 30 Days by Karen Wiesner. I'd like to buy both, but I have enough money for just one of them, so I'm kind of torn between which one to buy. What do you think? Which one should I buy first?