The 9800 GTX looks good as always, but with word coming that NVIDIA are already talking about the 9900 series, you have to wonder how many people are going to jump on the bandwagon.
As usual, the ASUS offerings carry with them a slight premium over other models, but the extra year warranty, CD Wallet and other pieces of software that ASUS include might be enough for you to spend the extra few dollars.
Dual GPU cards are good, but they still aren't the most practical solution. This is especially the case when you compare a card like the GTX which comes in at about 30% cheaper and its ability to stay on the tail or outperform the dual GPU based cards in some situations.
Hopefully ASUS decide to mix it up in the near future with the release of a TOP model, which will not only carry with it higher clocks speeds but hopefully a full version game as well.