Excellent list and I can't say I disagree with any of your selections as each are worthy of "top 25" status. I also agree with Wolverine that the barn-burning spectacular against the Cowboys in the rain back in 1980 needs to be considered as top 25 material given that it broke a 12-game losing streak to the Cowboys and had all the highs and lows that made your head spin.
No discussion of the "top 25" all-time Giants games should be complete without including the championship games of 1934 (i.e. Sneakers game vs Chicago), 1938 vs Green Bay and 1956 against Chicago. Each of those are considered highlights in the all-time history of the organization and deserve inclusion.
In reverse chronological order, here are some others that I believe are either worthy of top-25 or honorable mention at the very least:
- Dec 17, 2005: KC 17 @ NYG 27: a heroic effort by an injury-riddled Giants team over an AFC contender that was highlighted by a legendary performance from Tiki Barber and an inspiring debut of LB Chase Blackburn who had over a dozen tackles in his first start.
- Oct 30, 2005: WAS 0 @ NYG 36: on the day they honored their patriarch, the Giants came out inspired and, led by Tiki Barber, put a serious a$$-whoopin' on the rival Redskins that would have made Wellington smile
Dec 12, 1999: NYG 19 @ BUF 17: the Giants drown "Flutie Flakes" and the Bills with a last-second drive that ended when reserve kicker Cary Blanchard kicked a game-winning 48-yarder
Dec 13, 1997: WAS 10 @ NYG 30: for a team that had recently sunk to the depths of the NFL, the Giants capped off a division title with an inspired effort over Washington, and former Giant QB Jeff Hostetler, by storming home to the title
Jan 02, 1994: DAL 16 @ NYG 13 (OT): even though this was a painful loss, it had everything you could ask for between heavyweight contenders with the prize (i.e. division title w/ home-field advantage throughout the playoffs) at stake. The Giants layed it all out on the line, erased a 13-0 deficit and clawed back to send the game into overtime, against what was the greatest team of the 1990s, before falling at the end
Dec 10, 1989: NYG 14 @ DEN 7: a courageous effort in the snow at Mile High where the Giants, coming off two bitter defeats at the hands of the 49ers and Eagles, played with desparation throughout. It was the game of LB Gary Reasons' career and highlighted by a Meggett screen pass he bobbled, secured and took to the house, the famous 4th and 1 goal-line stand where Reasons popped Humphreys so hard he knocked his mouthpiece out and holding on for dear life at the end when they held off Elway long enough for the clock to run out for the big victory
Sep 11, 1989: NYG 27 @ WAS 24: one of the legendary Parcells-Gibbs matchups, this season opener saw the Giants jump out to a big early lead, only to have the Skins storm back and lead by a TD, to Simms marching them back down the field for the tying TD and capped by a Raul Allegre 52-yard FG as time expired for the big win
Nov 27, 1988: NYG 13 @ NO 12: simply put, the game that launched LT to the top of the Mt. Everest of the greatest ever. In a game missing Phil Simms, and the Saints threatening to run away with the game, LT single-handedly stopped the Saints and gave the Giants' offense opportunities to win it ... which they did when Paul McFadden drilled the winning FG in the final seconds
Dec 01, 1986: NYG 21 @ SF 17: nothing can be finer than to beat the 49ers! A 17-0 halftime lead evaporated when an angry and determined Giants team flexed their muscle on national TV, and in front of the arrogant 49ers fans, to completely dominate the second half and wow Giants fans with a display that had rarely been seen before.
Nov 25, 1984: KC 27 @ NYG 28: despite three quarters of frustration, the final quarter set the stage for what was Phil Simms' first great comeback performance in his career as he led two scoring drives in the final eight minutes to pull out a big one.
Sep 09, 1984: DAL 7 @ NYG 28: this was the first time I had ever seen the Giants kick the living $h!t out of the Cowboys and it gave me (as well as all the fans at the stadium that day) great pleasure ... 'nuff said!
Jan 02, 1983: NYG 26 @ PHI 24: the Giants send off Ray Perkins to Alabama with a spirited effort that culminated with a Joe Danelo chip shot winner at the gun.
Oct 25, 1981: NYG 27 @ ATL 24 (OT): the Giants defeated the team picked in the pre-season be be in the Super Bowl. The Giants shut down the #1 offense in the league and managed to kick the winner in OT
Oct 28, 1979: NYG 20 @ LAR 14: the Giants defeated the eventual NFC Champs in Los Angeles (first time since 1959) with a courageous effort from Phil Simms, who was knocked out of the game but came back to lead a number of big scoring drives and completely frustrate the more physical Rams in one of the most memorable games of that era.
Nov 14, 1976: WAS 9 @ NYG 12: the first Giants win ever against George Allen ... which ended the ordeal of Giants players not shaving until they defeated George Allen and the Skins; it was also the first ever win in Giant Stadium for Big Blue
Nov 26, 1972: PHI 10 @ NYG 62: the Giants clicked on all cylinders to score the most ever points in their history
Nov 08, 1970: DAL 20 @ NYG 23: the hated Cowboys go down in the final minutes with a Tarkenton laser beam to Ron Johnson for the winning points.