It's simply a great computer. There isn't much not to like, and there is plenty to love. Sure Apple may come out with some changes or other BTO options, or tweaks to various components... but i doubt anything will be a substantial break from the current line up. All current MP's will be very powerful computers for the next 5 years. If something else does come along that you 'have to have', then you can always sell what you got and upgrade. So no reason to be sad! Enjoy it now, rather than agonizing over finding 'just the right time'.
Congrats on your purchase (i pick up mine tomorrow!)... Let us know how it goes for you with your usage patterns.