I thought I'd comment here again, since the laptop I ordered got here yesterday and I've spent a little bit of time with it (although not much, so this is just a first impression).
Lenovo thinkpad t430.
Very well made. Keyboard is really comfortable. More comfortable than the one attached to my desktop that I'm typing this with. The trackpoint (red thing in the middle of the keyboard) is a little bit disorienting to use at first, but I could definitely get used to having it and it's an absolutely brilliant idea. I bought one that came with a docking station (which can be bought separately). The docking station is really nice.
It's got a third generation i5, with a socketed cpu, so I can upgrade it to an i7 of the same generation. Laptops with socketed cpu's are not easy to find.
The screen isn't great, but I knew that would be the case before I bought it and it's possible to upgrade it (although the upgrade on the t430 isn't quite as straightforward as some of the other models, apparently, but still not actually that difficult.
The only thing that doesn't make sense to me is that the two ram slots are separated. One is accessible by removing two screws and a small panel on the bottom of the computer, the other requires the removal of the keyboard in order to access it, but the keyboard is designed to be removed easily (which is a HUGE plus compared to some other laptops that require a complete disassembly in order to remove the keyboard, and really aren't meant to be disassembled at all (which means that something will almost definitely get broken during the process)).
It isn't the smallest laptop, but it isn't huge either.
Anyway,
first impression is positive.