Top 29 WM Matches:
1) Bret/Austin WM13
2) Taker/HBK WM25
3) Bret/Owen WM10
4) Austin/Rock WM17
5) Taker/HBK WM26
6) HBK/Jericho WM19
7) HBK/Razor WM10
8) Taker/Batista WM23
9) HBK/Angle WM21
10) Benoit/HBK/HHH WM20
11) Austin/Rock WM19
12) Taker/Edge WM24
13) Savage/Steamboat WM3
14) Taker/Orton WM21
15) Punk/Jericho WM28
16) Hogan/Savage WM5
17) MITB WM21
18) Edge/Foley WM22
19) MITB WM24
20) Flair/Savage WM8
21) Lesnar/Angle WM19
22) HBK/Cena WM23
23) Savage/Warrior WM7
24) Flair/HBK WM24
25) Taker/Kane WM14
26) Taker/HHH WM28
27) Taker/HHH WM17
28) Eddie Guerrero/Kurt Angle WM20
29) Edge/Jericho WM26
Since I'm far too lazy to make a list of my own, let me just say some things I'd change on your list, as a way to customize (remember, I'm lazy).
First is I'm bumping HHH/HBK/Benoit to the #1 spot. I love Hart/Austin, I really do, best moment in wrestling history to me as a fan, when Austin is riving and the blood is falling down his face, dripping off his nose. It's a brilliant match, but the question I ask myself is: Which match is a funner watch? Which match I enjoy more, keeps me more entertained? That triple threat has everything, unpredictable anything can happen finish, great submissions, sweet chins, I've seen it a million time, and everytime I watch it, it's completely riveting. It's fresh. It's new somehow. And when I rewatch the HBK/Taker matches, I just don't get that same feeling. At all. When I rewatch Austin/Hart, I'm bored with the work in the crowd and I'm just waiting for my moment, noticing it's weaknesses in the quality of the picture (seeing how it was from Mania 13). It just felt old. And I realize that this maybe a completely subjective thing, but those lines have been blurred for a long time kid.
I like the fact that Savage/Steamboat didn't make the top 10. Hell, on my list, it might not make the top 20. And say what you want, this is the Stairway to Heaven of pro wrestling. It's automatically billed as the best match/song ever, and if you don't think so, then automatically there's something wrong. It's idolized and put on a pedestal and almost seems to represent something other than a match. I understand that it was Wrestlemania 3, a number that we are about to TRIPLE (this match is old) it has a completely different pace. This is what I'm talking about when a few weeks ago I mentioned the significance of "Era's" in WWE. This is a match of a different era, where Randy Savage would jump off the top rope every night and people thought he was Jeff Hardy. It's a different product. What might have been 'catch-as-catch-can' back then isn't the same. It's a fine match, really, even if overrated. It really needs a context.
I love the love you give to Orton/Taker. One of my favorites from the Streak- probably the match that was most likely to see the Undertaker lose. It made the most sense here to give a completely mortal, now humble streak away to a rising young star, give him a lot of moment, pretty much do what "The Streak" was designed to do: Put over another worker. Except since it's Taker it's better off he just puts himself over. Which is fine. In fact, it's the way it should be. But it's just a really cool match.
Also like the respect given to HBK/Jericho.
Would definitely bump UP Lesnar/Angle. I'm a really, really big fan of Mania 19. Probably helps that I'm in Puget Sound.