Welcome to the Forum.
The ATxmega128A4U is at the high end of the AVR line up.
It is tough to "breadboard" a prototype with the Xmega A series, but it is a great chip.
Care to share what your project is about?
THis thread is a split from:
Perhaps a silly question, but how do I contact the official powers that be to correct a presumed website "typo"?
JGM - Moderator