Considering this one...

Buy Samsung NP900X3D-A01 Ultrabook

Any opinions?

My spec is for a small portable windows laptop with a high screen resolution, hard drive size is not that important and I don't think I really need more that 128, 4GB ram seems small and I am not sure yet (conflicting interweb reviews) if it can be upgraded to 6 or 8.

Cheers.