I can think of some good choices, but the timing's not right. Face Orton vs. heel Lesnar wouldn't be too bad, but with Lesnar as a face it wouldn't make sense, and I have no desire to see Orton turn heel again already.
Would love to see Cesaro get the rub of working with Lesnar, but again, face vs. face in this scenario doesn't work, and I don't want to see Cesaro turn heel.
Austin doesn't interest me though, pretty much for the reasons I stated above. I don't feel the need to constantly see the big names of today facing the big names of yesterday. We got Hogan vs. Rock in 2002 and we got Rock vs. Cena in 2012 & 2013, that's enough for now.