All I can tell you is: Do NOT get Alienware!!!
There are too many horror stories floating on the web about this company and their laptops. I was planning on getting an Alienware laptop at one point until I did a search on them. The Area-51M laptop seems to be the one everyone has problems with.
Here are a couple of reviews on it. You can come to your own decision
about it:
http://reviews.cnet.com/Alienware_Area_51m/4852-3121_7-20857400.html?tag=tab
http://str8dog.com/articles/182.aspx
http://www.pcworld.com/reviews/article/0,aid,110976,00.asp
There are, of course, a lot of good reviews on it. The problem seems to come with age, however. Use it for a couple of months and things seem to break down for no apparent reason.