Why Neal, though? I know he did JIMMY OLSEN covers, but he's more a Batman kind of artist, isn't he?
Well he did more than just a few Jimmy Olsen covers, LOL.
Neal Adams super massive ego might be too hard to deal with, but he is friendly with Maggin, so I would team both of them together.
Neal's Superman Check List from his site:
ACTION COMICS (DC)
Cover only - #356, 358, 359, 361,362, 363(Layout by Carmine Infantino), 364, 366(Layout by Carmine Infantino), 367(Layout by Carmine Infantino), 370(Layout and half pencils by Carmine Infantino), 371(inks over Swan), 372, 373(inks over Swan), 374, 377(inks over Swan) , 378(inks over Swan), 379(Layout by Carmine Infantino), 398(Layout by Carmine Infantino), 399, 400, 402, 404(Inked by Giordano), 405(Inked by Giordano), 419(Inked by Murphy Anderson), 466, 468, 473, 485
#425 (July 1973) "The Short Walk To Disaster Contract" (6 pages) Written by
Len Wein, Adams pencils, Giordano inks the Human Target (1973)
ADVENTURE COMICS (DC)
Covers only - 365-369, 371-373, 375, 376(inks over Swan), 377, 378, 379, 381(inks over Swan), 382(inks over Swan), 383(inks over Swan)
ALL NEW COLLECTORS EDITION (DC)
#C-56 (1978) (72 pages) "Superman VS. Muhammad Ali" Script based on an
original story by Denny O'Neil and Neal Adams, adapted and penciled by Neal Adams, inked by Terry Austin and Dick Giordano
AMAZING WORLD OF DC (DC)
#8 (September 1975) Carmine Infantino sketch
Special (February 1976) (5 pages) Never before published Superman story.
Written by Len Wein, Adams pencils (no inks)
JIMMY OLSEN (DC)
Covers only - #109(Infantino Layout), 110(Swan Pencil), 111, 112, 115, 117(Swan Pencil), 118(Infantino layout), 120(Infantino layout), 121(Swan Pencil), 122(Swan Pencil), 132, 134, 135, 136, 147,148
Covers only (inks over Jack Kirby) - 137,138,141-144
JUSTICE LEAGUE (DC)
Covers only - #63(NOT ADAMS. Art by Mike Sekosky), #66(Infantino layout), 67, 70(Infantino layout), 74, 79, 81, 82, 86-89, 91, 92(Infantino layout), 95(partly penciled by Swan), 96, 97, 98, 138, 139
#94 Cover and (November 1971) "Where Strikes Demonfang?" Written by Mike Friedrich, Adams pencils pages 1, 5, 20 and 22
LIMITED COLLECTORS EDITION (DC)
Covers only - C-39, C-46
#C-23 Reprint of House of Mystery #179 "Widow's Walk" (10 pages) and #186
"Nightmare" (12 pages)
#C-25 "Batman" Reprint of Detective #404 "Ghost Of The Killer Skies" (15
pages) Joker, Enemy Ace
#C-31 "Superman Park" (2 pages)
#C-38 "Superman" Reprint of Superman #254 "The Baby Who Walked Through
Walls" (7 pages)
#C-39 (October-November 1975) "Secret Origins Super-Villains" Reprint of
Superman #249 "The Origin of Terra-Man" (7 pages) Dick Dillin pencils, Adams
inks
#C-43 (February-March 1976) "Christmas with the Super-Heroes" Reprint of
Batman #219 "The Silent Night of the Batman (8 pages)
#C-48 (October-November 1976) Superman VS Flash, (6 pages) Plans for
Superman's Fortress of Solitude
#C-51 (August 1984) Treasury size Reprint of Batman #232 and 237
#C-52 "Best of DC" Reprint
#C-59 "Batman's Strangest Cases) Reprint
LOIS LANE (DC)
Covers only - #79, 80(Penciled by Swan), 81, 82, 83, 94, 95, 96, 87, 88, 89(Infantino layout), 90(Infantino layout), 91, 92(Penciled by Swan), 93(Penciled by Swan), 94(Penciled by Swan), 95(Penciled by Swan)
SECRET ORIGINS OF THE SUPER DC SUPER HEROES
Cover only - 1976
SUPERBOY (DC)
Covers only - #143,145-153,155,157-161,163,164,166-168,172,173,175,176,178
SUPERMAN (DC)
Covers only - #204, 205, 206, 207(Penciled by Kurt Swan), 208, 210,213(Penciled by Infantino), 214, 215, 218(Penciled by Swan), 219(Penciled by Swan), 231, 233,234, 235(Layout by Infantino), 236, 237, 240(Layout by Infantino), 241, 242, 243, 250(Loose Layout by Infantino),251(Layout by Infantino), 252, 263(Inked by Murry Anderson), 307, 308, 313(
), 314(Penciled by Kurt Swan), 317
#249 (March 1972) Cover and "The Origin Of Terra-Man" (7 pages) Written by
Cary Bates, Dick Dillon pencils, Adams inks
#254 (July 1972) Cover and "The Baby Who Walked Through Walls" (7 pages)
Written by Len Wein, pencils and inks by Adams
#257 (October 1972) "The Greatest Green Lantern Of All" (8 pages) Story idea
by Adams but his plot was not used (no Adams art)
SUPERMAN FAMILY (DC)
Covers only - #182-185
#171 (June-July 1975) Reprint of World's Finest #176
SUPERMAN FROM THE 30'S TO THE 70'S (CROWN and BONANZA BOOKS)
(1971) Reprint of many Neal Adams Superman covers in the gallery
SUPERMAN FROM THE 30'S TO THE 80'S (CROWN BOOKS)
(1983) Reprint of many Neal Adams Superman covers in the gallery
SUPERMAN GALLERY
#1 Adams pinup
SUPERMAN VS THE AMAZING SPIDER-MAN
(1976) Adams redrew some shots of Superman over Ross Andru
SUPER-TEAM FAMILY (DC)
#1 (October-November 1975) Reprint of World's Finest #175
#2 (February-March 1976) Reprint of Brave and the Bold cover of #79 and
story from World's Finest 176
WORLDS FINEST (DC)
Covers only - #174, 178-180, 182(Penciled by Kurt Swan), 183(Layout by Carmine Infantino), 185, 186(Layout by Infantino), 199, 200, 201(Layout by Infantino), 202, 203, 204(Giordano Inks), 205, 208, 209(Giordano Inks), 210(Giordano Inks), 211, 244-246, 258,
#175 (May 1968) Cover and "The Superman-Batman Revenge Squad" (17 pages +
cover) Penciled by Adams, inks by Giordano
#176 (June 1968) Cover and "The Superman-Batman Split" (18 pages + cover)
Penciled by Adams, inks by Giordano
#223 Reprint of Strange Adventures #206
#226 (November-December 1974) Reprint of Strange Adventures #207
#230 (June 1975) Reprint of Challengers of the Unknown #74
#302 (April 1984) Reprint of World's Finest 176