Wanting to buy another laptop

I am going to want another laptop in the near future. Size about 15-17" is what I would like. The biggest problem that I encounter when looking for one is whether I need a firewire port or not. That is what I would like someone to suggest to me what would be best. I will be using it for general surfing but it will also be used after games where I will want to download a game into the computer to transfer it to another computer for editing or do some editing on it also. Is it necessary to have a firewire port or can I buy an add on card with firewire in it? What is the most feasible? That would greatly increase the choice of computer I could buy.