Boss me around.

I am going to have to buy a new laptop, I think. Which of these computers should I get?

ThinkPad T-61
ThinkPad T400
ThinkPad T500

IdeaPad U series

ThinkPad X300 ($$$!)

I am going to buy one of these computers. It will be my only personal computer.

Things I will want to do on it: play Spore, watch downloaded TV episodes (smaller displays therefore deprecated), and surf the net.

Things I will not want to do: carry something 5+ pounds unless absolutely necessary, buy a dock, or buy ANY other brand. I get a discount on ThinkPads, my previous ThinkPad is 5 years old and has only needed one minor repair---stick to the list! Which one will be mine?