What is the best Windows 8 touch screen laptop available for around $500?

I could only find two ASUS models: the VivoBook X202E-DH31T and the Q200E but memory maxes out at 4GB for both.

Anyone know of any other models with more expandable memory?

Newer and cheaper touchscreen models are supposed to be available this summer. Anyone have any details of upcoming models in the $500 price range?