As I have had the Galaxy Nexus since release date in the UK I have enjoyed the pure Google experience, this may have influenced my leaning towards a phone with as little Custom UI as possible, especially as previously Sense has been far and away my favourite manufacturer UI.
To get to the point, which I haven't done so far, my choices would be
2.Samsung Galaxy III
3. Asus Padfone ( a beautiful designed handset if the version shown is to be the final version)
4. HTC One X
If only HTC would have their best widgets as stand alone widgets that did not rely on Sense