DON'T GET ALIENWARE!!!!!!!!
Now, this is a big blanket statement - however.. I have an Alienware laptop for work, have 4 co-workers with Alienware laptops, and I know one guy with an Alienware PC. Every single one of us had problems with our systems, and all of us were just horrified at the lack of help/competence from Alienware. In fact, for 3 of us with the laptops, they were simply defective and were randomly shutting down, or not turning on - and when we sent them back for service- they told us there was nothing wrong with them.. and sent them back to us untouched!!!!!!!!! We had to send them back again.. then all of us STILL have problems and issues with these things. I HATE Alienware now - please don't throw your money away on one! The only thing good about Alienware is that they look sorta cool.
If I had to choose between a Dell and an Alienware, I'd get a Dell in a second.