I did put some thought into this though, for if I do end up keeping them. The choice really comes down to Debian and Gentoo I think. I like the configuration of Gentoo better but I'm not sure I want to invest that kind of time for old machines that are really only around as backups anyway. I have also found that they now only barely run well with Arch and I'm not too confident in their ability to compile large software sets. I don't really like APT and find Debian's packaging to be a bit "messy" sometimes but it's probably the best bet now for 32 bit support moving forward.