I always make my dream matches out of wrestlers who work for different promotions because that's what I see as a dream match: something I want to happen but it has little chance currently. For example, in 1993, my dream match was Bret Hart vs Vader. Unfortunately, that match was a big disappointment when it actually happened. For a while I really wanted to see Awesome Kong vs Beth Phoenix. I didn't really think the match would be that good but they were the two strong women in different promotions, so I was interested.
At the moment, from wrestlers in the WWE/NXT I would really like to see Shinsuke Nakamura vs Brock Lesnar. I don't really expect it to be great, but I've just been really curious about seeing it.
If I can pick any two wrestlers in the world and put them in a dream match at WrestleMania, it would have to be Kazuchika Okada vs Seth Rollins. Okada is my favorite wrestler in the world right now and Rollins is likely my favorite in the WWE. How would I book it? I have no idea. I'd actually prefer someone else to book it so I could just sit back and enjoy it and wonder who would win.