Thanks for the great response!
Also, which memory would be a good fit? I've got a bunch of CAT25C256 and CAT24C256 (also have the 128k versions) parts in stock. I also have a a coiuple of 23A1024s in stock. Will any of those work? I saw the schematic, but it didn't really specify what kind of memory would work, or if there was a size you had in mind. If there's a specific chip you designed for, I can probably sample that next month, if I don't already have it.
Thanks again!
Have a great holiday.