I have an Aurora m9700 Conspiracy Blue with AMD Turion x2 64 2.4Ghz processor, 2Gb RAM, and 2 HDD's both 7200RPM, an 80Gb (O/S and apps) + 160Gb (everything else). Have MS Windows XP Media Center Edition. The unit is pristine and running perfectly, its my daughter's laptop. Being a diehard Alienware laptop guy, I had her keep this as a desktop alternative as she uses a 14" laptop which is more mobile for school and work. I am thinking of upgrading it for her to MS Win 7 Ultimate 64, which I am sure it will run without a hitch, but with larger drives installed first.
These units have been a major hit and favorite among Alienware enthusiasts and probably why in some cases maintain a decent value. She does not intend to ever sell it, she loves its performance even though technology and Windows have upgraded plenty over since its release. I always enjoy using it myself when she brings it over or when I am by her place. They are solid and run great even in comparison to today's designs. All three colors, Conspiracy Blue, Cyborg Green, and Saucer Silver look wicked. I find them selling on eBay between $350 to $700 depending on condition and added stuff. I would not go above $500 myself for one regardless of the condition and what ever added accessories the seller is giving you. I would tell you if you do find one at a price you can meet of the same 2.4Ghz like mine, maybe max out the memory and put a larger 7200RPM drive build it with Win 7, you will enjoy it, no doubt.
Of course its weight, size, and battery is a consideration if intended to travel with it, but as a rock solid design and performer of a laptop, I would not let that stand in your way.