Lesnar vs 80s Hogan has an interesting dynamic to it. Just for something a bit different.
I mentioned in a thread recently how perfect this match would have been in the 80's. In a time when big men or muscled up men where seen as the perfect foil for Hulk Hogan (Andre The Giant, Paul Orndorff, Big John Studd, King Kong Buddy, Earthquake later on in the early 90's, etc.)
Vince would have creamed himself to have a beast like Brock Lesnar (who's both big and athletic) on his roster back then. He and Hogan would have been the perfect Wrestlemania main event. I also think the booking of it would have gone a bit differently than most of Hogan's booking back then, which usually consisted of an evil doer trying to knock Hogan off his throne but failing. I could see them having Lesnar destroy people and even leave the audience in shock of defeating Hulk Hogan cleanly (like he did in 2002, though it was a different time, but that's why it would be so shocking back then) and then building up to the big rematch where Hogan tames the beast and reclaims the title at Wrestlemania.
As for modern day, I'd probably go with Ziggler/HBK, HBK/Punk, Bryan/HBK, Angle/Bryan, Angle/Ziggler as my top picks of matches I wouldn't seeing (in the realm of plausible reality.)