And if you wait, then you might as well wait 'til even better technology arrives, and when that point comes, you can wait for even better than that, and so on, ad infinitum.
i would wait my tv broke last year but i am waiting till UHDV 4320p are out but i am a bit scared that when that comes there might be something new on the horizon. so i might wait and see. meanwhile i will be happy with no tv.
I got the new MacBook Pro when it came out last November. Typing this on it now. Brilliant machine.
The only thing you should think about now is that Leopard is due out about mid-June time. If you buy the machine now it'll have Tiger, and while that's excellent, Leopard will have new features that to upgrade you'll have to pay �40 for or something like that. If you can wait til June, I'd recommend you do that.