To start off I want to mention that we try to avoid recommending specific devices to customers for memory and other external components. Because of the large number of choices out there it is impossible for us to have hands-on experience with all of them, and we don't want to recommend devices that we haven't used ourselves. We are at least indirectly recommending devices by including them on our EVBs and reference designs. So in most cases our best recommendation is to use the devices we have used or at least find something similar that will meet your specific needs.
A memory used on EVB is Cypress CY7C1339G
Also I could mention other devices used with different EVBs along with similar MCU having the same or backward compatible EBI module:
Hope it helps a bit