Thanks for all the great comments and pointers. As for 4 GB in the netbooks, everything I've researched seems to indicate that Intel limits RAM to 2 GB as part of the Atom chipset/motherboard design specs. That said, I'm buying a couple of 4 GB SO-DIMMs for another machine of mine and will definitely pop one into either or both of these netbooks to see what happens. If they work or not, either way I'll report back here.
As for the Aspire omission: I purchased both of these netbooks with my own hard-earned cash. The chancellor of the exchequer--my wife, that is--forbade me to purchase a 3rd netbook for cost reasons. If you want to loan me your Aspire, I'll gladly make the upgrades and photograph them, then return it to you exactly as it was sent to me (and cover shipping both ways). I wanted to get one of those, and a Samsung, and a ..., but "you can't always get what you want."
Thanks again to one and all,
--Ed--