I think a Carwin rematch would be interesting. Or perhaps Cain. The only other person I can think of would be Travis Browne, but I don't think Browne is ready for that fight given his last fight against Broughten.
What say you? 
Cain
Cain Velasquez !! 
Yeah, Cain m makes the the most sense for sure
Sergei would be cool
i think Cain would be a great fight for a lot of reason, but if Cain wins, then i think he's definately the top contender. if Mir wins, then i think he should be next in line...
Cain orstruve
RandyDarsh - Cain orstruve
Lol. Struve is fightin Herman and even though im a fan, he has no business in the cage with Mir yet
LOL at everyone pretending they're not wishing for the Mir-Sim trilogy to be completed.
Cain
Honestly, I would almost rather see Mir vs Overeem as opposed to Brock.
Steven segal.
NarlyPersianDude - Well Cain or the loser of Overeem Brock. Nothing else looks right
Well the only reason I suggested Carwin was because he fought Mir after Mir went bat-shit crazy from Brock and was trying to become a giant. I think it would be a bit more competitive this time around.
Cain vs Werdum
Oops. Meant Mir vs Werdum
a juiced brandon vera rematch. r at the very least a moonfaced vera on HGH and TRT
Barnett
Barnett vs Mir would be a great match, but Barnett is stuck in Strikeforce. If Werdum wins then have him fight Werdum. If Werdum loses have Mir fight Cain.
Let's see him fight Bigfoot silva
Barnett would be my first pick .Werdan would be ok but hes fighting Nelson.Cain fits the bill