If it's a dream team situation with no holds barred, I'd have...
LEGION OF SUPER-HEROES (Bi-monthly, 12 issue maxiseries, 40 pages)
Plot/Concepts: Grant Morrison
Script: Robert Kirkman
Penciller: Pasqual Ferry
The Omni-Wave strikes the Future and the Legion of New Earth assemble to explore a bold new era of heroism!
(I'd direct this to be a soft reboot of the Threeboot era with selected Silver Age and Reboot concepts woven back into the mix and plenty of Morrisonesque high concepts! Kirkman provides the dialogue and team interplay needed with a large team of teens, and Ferry's visuals are a perfect match with superkids and future-tech alike.)
LEGION: ESPIONAGE SQUAD (Bi-monthly, 6 issue miniseries, 32 pages)
Writer: Andy Diggle
Penciller: Ivan Reis
The Future may be bright, but some heroism is best done in the dark...
(Invisible Kid, Triplicate Girl, Chameleon, Phantom Girl, Shrinking Violet, Gear and others explore the seedy underbelly of the future. Andy Diggle gets deep into the foundations of the high concepts from Morrison, with gritty visuals from Ivan Reis.)
LEGION OF THREE EARTHS (Bi-monthly, 6 issue miniseries, 32 pages)
Writers: Geoff Johns and Keith Giffen
Penciller: Mark Farmer
Worlds Collide and the Legion will never be the same again! The Legion make their stand against the Omni-Wave... and fail! But how does the 52 figure with the successor Legion of New Earth?
(I'd assume the Threeboot Legion occurs on another of the 52 Earths - shades of the Pocket Universe with Supergirl I know - and this mini-series would show the meeting of the Preboot, Postboot and Threeboot Legion as they struggle Crisis-style against the Omni-Wave that threatens to rewrite reality, and what happens after they fail!)
The basic idea would be that there'd be a Legion comic every week, the first year alternating between the oversized main LSH title and the Espionage Squad, to tease the reader with some big plots and varied detail of a new vision of the Legion that would tweak the Threeboot to incorporate more elements from previous continuity with a view to reintroducing the fun and future-wonder of the original Legion series. The second year would see the continuation of the LSH title with a second story arc, alternating monthly with the Legion of Three Worlds miniseries to showcase the various Legions and explain the mystery of the New Earth Legion seen in the main title. At the end of the two year period we'd see either the New Earth Legion relegated to being 'just another 52 Earths Legion', or continued as a 32-page monthly title. It'd also be an opportunity to examine the Legion heritage as a whole with a view to integrating fan favourite concepts while working within the established DC 52 Earth continuity.
And you better believe Xs and Gates'd be involved somehow!
Oh yeah... I forgot the short version.
If it was just throw these guys at the title and see what they make of it I'd have my LSH title team of:
Plot: Grant Morrison
Script: Robert Kirkman
Pencils: Pasqual Ferry