Aloha,
I have a Pc at home with a tube monitor which i really trust the color on to prepare my files for my lab, I am running xp on that and CS5
I have used a number of laptops when traveling, I clean the the laptop prior to traveling to free up disk space, I do some culling and sorting after each days shooting and store everything on the laptop so I start out each day with clean SD cards , If get some really nice shots. I'll back them up to a SD card, I always keep the spare SD cards with good shots on me, not in my camera bag, this way in a worst case situation, of stolen or lost everything, i come away with my shots...
I run cs5 on the laptop, and can get a pretty good idea as to the quality of the shots, I bracket a lot so I can fill a hard drive pretty quick, but cull a lot of stuff right on the lap top, I don't do any editing on the laptop, as I normally don't have the time anyway. the screen on my laptop and the screen on my home pc don't really reveal the details of my files, as neither one is very high resolution, I don't look at the screen image on my camera that much other than for composure and glaring mistakes, I trust the histogram more and rely it it more.
most laptops with a big hard drives won't have any issues loading and working with big files just get one with the latest and greatest Intel and it should handle any load...
I am normally pleasantly surprised by the clarity of my shoots when the proofs come back from my lab; they mostly look much cleaner crisper and sharper than any view on my monitors, i am very careful not to over sharpen the files now, and only do a final sharpening print size after a few proofs now.
Its on my wish list to get a giant high res monitor but they are pretty expensive...