Audio Production Laptop

[Daniel Green]

I'm looking to get my hands on a laptop I can use for audio production
and live performance with UbuntuStudio. I need a bit of help finding
something suitable. I figure the following should be taken into
consideration:

Fast hard drive
Multiple(?) Firwire ports
USB ports
Decent sized screen.
Long battery life
Linux friendly.

No need to worry about the audio card as it should be replaced with
something external anyways. Any recommendations for this too?

I am open to and appreciate all advice.

Thank you!
Daniel.