Hey!
I'd recommend the Smart Choice series by Oxford University Press. The first book is indeed Called FIRST CHOICE (used for real beginners) . I own an English Language school and this material is EXCELLENT for both group or individual classes. It comes with a very nice CD-Rom too. The book has been recently released and I´m sure you'll love it! Its very up-to-date and it contains lots of things teenagers dig! If u want to check it, you can go to
Oxford University Press: OUP.COM Home Page