I am about 5-10 issues (per title) away from finishing runs of of most of the DC "legacy" titles -- runs that begin with the last 12 cent issue and end at the last issue before the New 52. I try to make sure all issues would grade at 8.5 of higher.
This includes:
Batman
Detective
Superman
Action
Superboy
Wonder Woman
Flash
Green Lantern
Justice League of America
Brave and the Bold
World's Finest
Let me interject: DC 100-pagers are a b-itch to collect in high grade.
I have "complete" runs of most Marvel books that I care about, including:
Uncanny X-men 94 through 544
Amazing Spider-man 150 through 545
Daredevil 158 through 381
And lots of shorter Marvel series, including every "X"/mutant spin-off from 1979 through to whatever preceded Marvel Now, the 70s Doctor Strange series, Moon Knight, Power Man & Iron Fist, Marvel "Star Wars," Alpha Flight, Werewolf by Night, Tomb of Dracula, etc. I have every John Byrne "Fantastic Four," every Berni Wrightson "Swamp Thing," every Geoff Johns book in his first 10 years in comics, nearly every Alan Moore, Neil Gaiman, Kurt Busiek, Garth Ennis and Grant Morrison book up through the modern age "breaks." For DC books, it's the same. Essentially any major series from about 1974 to the end of the era that preceded the New 52, I have complete runs. All incarnations of the Legion of Superheroes, New Teen Titans, every "Bat" spin-off from 1975-ish on, etc. Again, all in 8.5 grade or better, most being 9.0's and up.
Besides finishing up my DC "legacy" titles back to the last 12 center, I'm slowly closing in on a complete Vertigo set, and runs of "House of Secrets" and "House of Mystery" beginning with their horror re-launches, and "Phantom Stranger," "Ghosts," and "The Witching Hour." And I'm eye-ing a complete First Comics run as well, since I have most of the major titles already.
Yeah, I know. Brag, brag, brag.