As for tuning tool, I haven't used any better than my trusted old ThinkPad X23. And I've used a lot of different ones. It has low weight (1.5kg's), VERY rigid and sturdy case (Magnesium alloy frame together with plastic that consists of carbon-fiber), normal 12,1" XGA screen and I bought new 4400mAh battery which makes it hold charge for more than 4 hours. Plus it's cheap!
Only drawback is a lack of COM port but I bought an adapter locally that has worked absolutely flawlessly for two years.