I was wondering...would it be smarter to buy a new imac while the ipod nano offer is still up, and then wait till october to buy leopard and install that, or should I just wait for leopard to roll out to buy an imac. The reason I worry is I don't know how well upgrading from tiger to leopard will be...will it erase all my data? Will be slower than if it was on my computer when I bought it?