This account of an unfinished article for Wizard got me thinking it'd be a good post here, something for you to think about over the weekend.
...While the main feature was proving a bit difficult to pull together, Andy and I came up with a killer sidebar we were having a lot of fun with: we'd pick the best members from all the various Legion incarnations and put together our own Ultimate Legion. We had a blast talking that out and would schedule meetings "officially" to talk about the news section or whatever and then have hour-long closed door sessions on who was the best Ultra Boy--awesome.
...Andy and I realized we wanted to include so many characters that our team was going to be huge even by Legion standards. We did not have much trouble mixing it up as far as having a diverse selection of creative eras represented as, while I can't recall our full team, but I believe we had Element Lad and Saturn Girl from the early days, Dawnstar and Wildfire from the Levitz/Giffen run, Gates and Live Wire from the reboot/Legion Lost era, and the Brainiac 5 and Triplicate Girl of Waid and Kitson's team; heck, I think we even threw "Five Years Later" Cosmic Boy/Rokk Krinn and Inferno from Legionnaires in for good measure.
So just for fun, who would be on your Ultimate Legion team? You can have anyone from any era or even any issue, with no restrictions at all on who you get, including multiple versions of a character through various timelines, reboots, alternate Earths, Elseworlds, animated, etc. You can justify your reasons or not.
Well, only one restriction: for tax purposes, you can't have more than 25 members.