I leave it somebody more anal retentive than I to map our hypothetical Alex Toth Omnibus, but I will say that it would absolutely have to be a multi-volume title.  Toth's career at DC (like Jack Kirby's) is broken into discrete phases that would lend themselves to multiple volumes devoted to the years 1947-53 (Green Lantern, Johnny Thunder and other western heroes, Streak and Rex the Wonder Dogs), 1961-66 (Eclipso, Rip Hunter, Hot Wheels, weird mysteries), and 1969-75 and '83 (a bit of this, a lot of that).

And, damn, while we're at this, shouldn't there also be a Mort Meskin Omnibus and volumes showcasing the DC stalwarts, Carmine Infantino, Gil Kane, Murphy Anderson, young Joe Kubert, Curt Swan?