Wrestlemania XIX
It was a near-perfect Wrestlemania that had a variety of matches. The only things I felt that this event could've gone without was the Miller Girls cat fight and maybe Undertaker vs Big Show/A-Train (could've given Undertaker a better opponent). The Brock Lesnar botch of course is what a lot of people tie this WM to which is something I wish didn't happen.
Otherwise, you had Stone Cold vs Rock III (where nobody knew at the time that it would be Stone Cold's retirement), Vince vs Hulk Hogan (at the time it was a good build), Lesnar vs Angle and HBK vs Y2J are some of the highlights of the event.