Laptop Choice?

I've used a laptop exclusively professionally for >10 years. About 6 hours a day with extensive travel. IBM (and then Lenovo) Thinkpads are light and reliable and have long guarantees, which get honored without fuss when needed. I have had 3 Thinkpads in about 11 years. The current one, an X60s, is 3 years old and still fine, previous two have been handed down and are still working, if a bit small and slow now.

My guidelines are:

• It must be light (a house brick weighs about 2.5kg - same as a light-ish laptop. Try a house brick in your courier bag!)
  
• Remember the weight of the charger too!
  
• Don't bother with DVD drive - extra weight; just mount one over the network if you need it and copy the files over.
  
• Get max installed memory from the outset. This allows for caching and increases battery life.
  
• Laptops are expensive to repair so get one with 3 year guarantee