The spec is good, except for the video card. ATI cards in the past have been known to have onboard memory reliability issue. Typical problem such as severe graphical artifacts when gaming due to memory chips failing. I would try to go with the GF based card.
Good Luck. I did have major problems with my Alienware. However, I will say, when it did work, it was awesome. Long story short, it literally went up in smoke on day 28. So after a VERY long battle with Alienware (about 3 months) I got a full refund. With that, I bought my gaming system (in my signature) which I built my self, and then purchased an Acer 5672 laptop. Both the gaming and laptop were LESS than I paid for the Alienware. Here is the kicker, I am a gamer, and do travel. My Acer laptop, which has the same video card as the one you were looking at, will play all the newer games at medium specs or higher, and all the older games at max specs. For instance I can play F.E.A.R. and HL2 at medium or above. Doom is at medium to high, and Star Wars Battlefront and Battlefront 2 are at max. I hope this helps, and good luck.
How about xtremenotebooks.com? Very good service and support reviews! Unfortunately the wife and I have to decide today. Sager looks good but on the inexpensive side with few bells and whistles. Wife REFUSES to buy a dell (Great for the wife of AMD Guy, no? ) She has to deal with them on a daily basis and says that their software support ****s. Configuring the Sagers to the full top end puts them in the same price range as the others, $ 3,000-4,000. Xtreme looks good with more extras and a separate warranty on the TFT display. Sager has the $ 200.00 no dead pixel plan as well. I think I will order one of the Xtremes and let you all know how it goes.