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ThinkPad X200

Compact and lightweight
Up to 8GB of RAM (user-upgradable)
Good battery life
All hardware works perfectly with upstream kernel
Best keyboard ever made (bonus: user replacable)
Clit mouse (X220 if you like touchpads)
12" 1280x800 display
WiFi, Gigabit Ethernet, Bluetooth
Webcam
Fingerprint reader
Labelled screws tell you what to open to get to which components
coreboot supported
Most HW works with niche operating systems (tested: NetBSD, Minix, Haiku, 9front)
$40-$150 on eBay