I would go with the Dell anyday. For a start it has the Intel processor which is better than AMD, second, i cant believe that a laptop under 700 has 2GB worth of graphics card, third, if you are ordering online from Dell, it sprobably better to get the 7200RPM 320GB HDD if you can because that way the boot time and program loading times are faster (plus external hard drives are cheap as chips) and fourth, I really like Dell.
Given that, the reasons I would go with the HP would be if it really does have a 2GB graphics card, if you are really concerned about battery life or if you really want a bigger screen. (IMHO, lightscribe is pretty useless, especially if you have a label printer)
Hope this helps, either way, enjoy your new laptop!
-Jakko