As there is no urgency, and you can afford to wait for the Core 2 Duo's to be part of the line up, you might as well.
However, there is no guarantee that Apple will put that processor into a laptop any time soon so your wait may be much longer than you anticipate.
The benefits and advantages of the Core 2 are primarily its speed and efficiency.
I'm not sure what you mean by flexibility but you will be getting the (current) latest processor in the machine.
I currently have a PC laptop. It still serves me OK, but it is old, slow and locks up often. I am dying to get a MacBook and utilize some of the software available for the MacBook. There is no urgency, except the wait is becoming a distraction. I expect the MacBook to give me some real gains in productivity. I am not a gamer. I use office applications and research the net.
What benefits or advantage will there be for me if I wait for the supposed MacBook/Pro with the new core 2 duo processor? Will I notice it much to make a difference? Will the core 2 duo give me more flexibility in the future?
I'd appreciate your advice.