The XPS 2 and the 9300 use the same ODM kit. The XPS 2 just has some different paint trimming, the extra clip-on cover option, and the LED's (thus, build quality should not differ). I'm not looking to get a notebook for gaming, I just wanted a mobile GPU that can really handle a WUXGA display (no lag when dragging windows over each other, 3D screensavers, etc.) and minimize CPU usage (not to mention advanced video decoding features) during DVD playback (i.e. PureVideo).
BTW, does anyone think the Geforce Go 6800 (standard or Ultra) supports HDTV/progressive scan output over DVI like the desktop counterparts? I've been looking for a notebook with this capability so that I can use the machine for DVD viewing on my HDTV in the living room (I had a desktop HTPC-like setup, but the machine was just too loud and took up too much space). I'd also like to try DVR w/MCE, but I'm a little doubtful about the quality of the external USB TV tuners that are available. The only other notebook that I've seen with the aforementioned features is the Toshiba Qosmio series, and those bastards are way overpriced.