Well if I wanted to go with Atmel, Comfile technology has an all-in-one 4.5" x 3.4" touch screen with a Dual Core Atmega128 @ 18.432Mhz for $359.00
http://cubloc.com/product/03_01ct1720.php
The video shows a "TouchScreenin5Minutes"
http://cubloc.com/phpBB2/viewtopic.p...fb4e60335638b8