I ended up taking a Lombard on my long trip. It held up like a true champ, took all the abuse, but it's heavy and uses assorted PC cards I have to switch in and out. (I got tired of fiddling with Pismo parts, and gave in and took the Lombard.)

So I got me an iBook 600 on eBay. It could use a little more RAM and an Airport card; I'll use the ones intended for the Pismo project. I believe it's the one from late 2001.