I will always go for the newest lenses if I need to addone into my kit no matter how expensive. If I cannot afford at this moment I'll just wait and work hard to get more money. That's pretty much my way of doing it, since that the updated lens is ALWAYS better than the original more or less. I just cannot stand it phycologically -there is a new lens on the market and I just spent 70% of its value on something old...