We don't have any idea yet what Leopard will include in terms of new and exciting features or even a firm availability date. Rather than wait for Leopard, I would wait for new processors if I were to wait at all. You can always upgrade to Leopard later on...but if you're prepared to wait 6-8 months for the new OS, by all means, go for it. You'll get a faster computer with Leopard on it at that time. It's a long wait, though. 🙂