Asus without a doubt
I recommend an Asus.
There are many reasons for that but I will be concise :
I have an Asus Z70Va (P-M 2.16 GHz, 2Ghz, 120Gb, Ati X700 128Mb, etc)
Case : it is really good. Actually, not a long time ago, Apple used asus
cases to build the powerbooks or ibooks. It also light (5.5 lbs).
Config : It is your choice, which is the best part. You do not get stuck
with fewer choices.
Price : It is not expensive as an IBM/Lenovo and you can build whatever
config you want. There are many online resellers which build
these machines. I am including a list at the end of this message
for you. I would avoid proprietary brands like Sony (check
other forums) but some people like their products.
Heat : My Asus Z70Va does not come any close to what a Macbook
produces. I was going to buy one Macbook but after going to
the store I decided to keep my Asus. I do not want a heater
in front of me all day long.
Linux : I am running Kubuntu (Ubuntu also works fine). Other people installed
Fedora but I just need a *nix environment to work.
To make thinges better, I have a dual boot with XP with a
common partition which shares my Firefox/Thinderbird folder (hence
no dual bookmarks or messages). Anyway, there are reports
of successfull Suse instalations either.
I was worried to buy a non-famous brand but a little Google/forums
research paid off. It is the best computer I had so far. You may want
to check other opinions but Asus is one of the best you can get.
Good luck !
www.agearnotebooks.com (I bought mine from them. Excellent services)
Geared2Play
mwave
Forums :
http://www.notebookforums.com/forum156.html
http://forum.notebookreview.com/