Hmmmm although all the classics come to mind, I'm gonna go with one which alot of you will insult me for, but my most memorable and favourite match was Chris Jericho V Chris Benoit in a ladder match at Royal Rumble 2001 I think. Just loved it, the clash of two technical greats with the added factor of ladders chairs etc.
People will say it's the obvious choice, and how anyone can say overrated I'll never know, hbk / taker from wm25 was a true epic match, and will be valued more in 10 years, not that it already isn't. It had great build up, and the fact it was the two best wrestle mania performers against each other. The match had it all, and i truly believe the greatest match of all time.