Probably just better put it on Craigslist and see what you get. Alienware is still a cool looking system and water-cooling is neat so you might find someone who isn't very knowledgeable about computers who will buy it.
One problem you might find, however, people who are not very knowledgeable about computers probably wouldn't need a computer like this.
So unfortunately you are in kind of a catch 22
Good luck with your sale though.