The MB and MBP are both fine laptops, and will do what you want them to do.
For 2 years now i have a 15" Core Duo MBP (first gen. so no Core 2 Duo). And I love this machine. although in those 2 years I did have to send it back for repair 4 times (yes even macs do break down sometime). But I always got great service, and it didn't cost me a cent.
The last time (last may) the MBP developed a graphical problem, and somehow i knew it was gonna take a long time to get it fixed. So I bought a white MB to replace the MBP until it got back.
The MB I bought was the last model with a combi drive in it, but with firewire 400
. I just used my time machine backup from the MBP and it worked like a breeze. Programs like Lightroom and Photoshop worked without problem, and even World of Warcraft worked without changing anything but the resolution.
But the bigest difference between the two that I found was the quality of the display on them. The quality of the MBP display is better then that of the MB. And I have seen reviews on the new uni-body versions that say the same.
So if you are serious about the photo and video editing, go for the MBP.
The 15" MBP is portable enough for taking it with you. The new 17" MBP looks nice, and has better battery life but its to big i.m.h.o.