Marshall

Thinkpad X200s pro:
Name
Look
Service
resell value

Cons:
Price  (SU3500~>HKD7000?!?!?, 160GB HD?)
Screen:  (1280X720 only)
Battery life

1810TZ
Pro:
Cheap Cheap Cheap!
Screen: 1366X768
Performance:  (SU4100 has a 4.0 rating in w7x64, SU3500 has 3.4-3.5)
Battery life:  6-8hrs real usage.

Con:
Look (subjective.  I think it is fine)
Service
Resell Value (But so cheap so I don't care.....)

In the end, I choose 1810TZ.  And going to buy 2 more 1810TZ.....