good linux laptop for ~ $600?

[myusername]

i am looking for a fast portable laptop for approx. $600. any help?
this is what i need:

it has to be linux compatible (doesn't have to come with linux. i just don't want wifi troubles or something like that)

fast

must have good battery life

[madjr]

can't get more compatible than these:

http://www.dell.com/content/topics/segtopic.aspx/linux_3x?c=us&cs=19&l=en&s=dhs


i got one and everything is great, price and guarantee/hardware support