I have a T40 with the "normal" screen resolution, which I run at the native 1024x768 on the 14.1" screen. I couldn't be happier with the machine.
I haven't seen a model with the higher screen resolution, but they are a lot more money and the native resolution 1400x1050 on the same size screen is going to make for pretty darn small text.
Re the Apple suggestions, I realize it's like arguing religion with a born again Christian, but the reality is that corporate America, i.e., over 90%, run Windows based PCs. It is extremely difficult to marry an Apple into that family, and technical support within the company is usually not geared to do so.
Apples are very fine stand-alone machine, and are fine if it is an all-Apple network at the office, but they don't mix well with Windows based PCs.
The reality for most employees at most companies is that they need a Windows based PC.