I've been thinking of getting a laptop and if I do, I'd like to use it for dj'ing.
I know next to nothing about dj'ing from a laptop (aside from just whacking an ITunes/WMP/Winamp playlist together) so I'm looking for some advice on what I should be looking for, what I'll need, software and that sort of thing.
I'm not tied down to any software but I'd be looking for something that brings me as close as possible to djing by CD.
Also I would like to be able to preview (my memory being as poor as it is). How does this work with laptops? Will I need a second sound card? I'm considering getting something custom built, are two built in sound cards a good idea or should I be looking for something external?
I know there's probably dozens of threads on this topic already

Thanks in advance for the help.
