I used to trade on my desktop, but have gradually moved everything to the laptops. The desktop replacement-type laptops are now plenty enough power and speed for my trading needs.
The mobility factor is huge to me, and unless you need to run a ton of monitors all the time, I don't know what the downside is. Some of the larger laptops even have full keyboards, the big ass HP one even has a number pad (although I am not sure I would recommend that model) And you can get wireless keyboards for when you are working at your desk, and of course you can plug second monitors in.
I have a Vaio that has a widescreen native 1920 x 1200 screen res. Not good for reading lots of text, but rocks for lots of charts when not connected to a second monitor. Its rather heavy, but I don't need to run a marathon with it, so I don't mind the extra lbs.
I can trade if I am traveling. I can grab my laptop and trade outside from my patio. Internet/power/whatever goes out at my place, I can grab the laptop and head to a friends. If I am stuck in a tricky trade but need to use my facilities, no prob! LOL, it would suck to have try and carry the desktop and monitor into the potty in a moment of dual market and bodily urgency, eh.
:eek: