The taskit Panel-Card seems good.
And beside this, the MINI2440 + LCD from http://www.developmentboard.net fits your requirements too,
Samsung S3C2440 (ARM920T) MPU
64M SDRAM, 64MB NAND flash, 2M Nor Flash
32bit data bus
ethernet, 2 x USB, 3 x serial port
check them out, might be interesting