"Almost" hair twin, you know I love the Sept 03 cut!
It really does flatter your pretty features. But if you want to try growing for a while, go for it! You already know how it looks short (Great!), so why not try it longer? If you get fed up or you don't like it when it's long, you know you can go back to the shorter style and still look great.
Besides, you can keep some layers around the front to frame your face as it grows.