Yes, wait.
Congratulations on your decision to purchase a Mac, I hope you enjoy it.
I agree with the other posters. I am hoping that I will be able to purchase a new Mac this year, but I am waiting for Leopard to come out first, so I won't have to pay extra to upgrade to it. There is the additional bonus that hopefully the next version of the iLife suite will come out around the same time as Leopard as well. And if things go really well, there might even be a new iMac by the time Leopard is released, which is the Mac I'd like to purchase.