For gaming, the X51 alienware would do well, so would the hp pavilion, all the others have weak graphic cards that could be easily replaced with a modest radeon 7750. Other than the fact that they are all overpriced and you could save a hundred bucks+ by building your own, they all are are priced in order of their ability.
hmmm, it won't be as good. I would say you should get medium settings with it at 1080p in modern games. The games you listed should run at higher settings because they are older. TF2 should MAX no problem. The problem that most of these computers have low end GPUs.
Only the bottom alienware will game past medium settings. And, its pretty overpriced.
they all overpriced , but picking a one that overpriced most?
read what he is saying -800$ what about a monitor?
the xps is the easy one to upgrade later, and wife will not even know, when this becomes a nice machine , after replaicing cpu and gpu, that way he spends least for start