I went with a T430, mainly because it's built like tank, and it's cheap enough that I'm not afraid to haul it around everywhere. At first glance it looks like an older computer, so I'm not too worried about someone stealing it either.

I love the trackpoint (don't have to take my hands off the home keys to use the touchpad). I also love the docking bay, with my mac I had to unplug the power, speakers and usb, now I just push a button and it pops off the dock.