Transformer Prime, Note 10.1, or Nexus 7?

I am going to sell my iPad 2 soon, and want an Android Tablet. 187526-asus-transformer-prime_medium

The Transformer Prime has the best design and materials, and a somewhat light skin with the cool keyboard dock.

Nexusdsc05220-1340897858_medium

Nexus 7. Cheap and pure Google. The screen is kind of small though.

Galaxy-note-10

Note 10.1 It has Pen input.

What would you guys recommend?