to actually bring 100lbs of computer stuff just to do some tasks is a severe case of OCD.
I have a Mac Pro 1,1 2.66ghz. I would NEVER go through all the crap of disconnecting all the cables, packing the mouse, keyboard, monitor and then moving the anvil-weight mac to a car and doing the same steps backwards to setup the computer and then AGAIN when bringing it back. I actually had to do a live green screen shoot with GSP once (George St. Pierre) for a marketing company, I had to bring the 27" iMac with me. That in itself was enough of a pain in the ass.
I now have a 2011 MacBook Pro Core i7 2.3ghz and it scores 10,500 (approx) in geekbench. My Mac Pro? 5,500 (approx). I get better processing performance out of my LAPTOP than I would with my Mac Pro.
To add to that, I'm now trying to sell my Mac Pro because it really is quite useless when I have twice the power in a portable and still able to connect it to my IPS monitor and get real work done even better. Its especially awesome when the laptop is fitted with an SSD drive for the OS and a 1TB drive in the secondary bay via optibay caddy (I am aware that others will need all 4 bays filled with drives in the terabytes, but there are many that dont, I being an example of that).
To the OP; just get one of the new laptops. They dont cost as much as a Mac Pro, theyre portable and they offer performance thats comparable to a lot of the other Mac Pros.