That is a very subjective question. What I consider the best someone else may not.
Do you mean best in terms of most expensive or the fastest Benchmark score.
Is it the one with the most storage or the most RAM.
You need to decide what you are going to want to do with the machine now and in the future. Are you a gamer, do you do video editing or just do the occasional Office document, email and surf the net.
Do you want and do you have room for a huge flatscreen monitor or is a 17/19" model enough.
There are literally hundreds of machines out there with 2GB of RAM and a great graphics card.
Having said all this Alienware click here make some decent top spec machines.