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Interesting that you are ditching the desktop to use the laptop in its place. I am doing the opposite. I have been using my MacBook as a desktop for almost a year, but it is troublesome to plug/unplug 3 or 4* cables every time I leave for school/get home from school. So, I ordered one of the new Mac Pros to have a dedicated desktop.
*Power, video, audio, and sometimes printer.
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Just 3 or 4?
I have 8. AC in, USB, VillagTronic card, audio out to amp & speakers, DVI out, ethernet, firewire, and depending on location either 2nd USB or 2nd firewire.
Takes less than 30 seconds on either end, and it’s a hell of a lot more portable than your Mac Pro 
Word. This is why I am considering it. Add to the mix the fact that I no longer store any documents or media ON the laptop or desktop, and the need for a desktop has disappeared.
The time it takes to unplug is nothing compared to the ease of workflow ( I do believe… ) that will come with a single machine in my life.
So. How much you want for that MacBook pro? 