season 8: Eric and Jen (because she provided drama)
season 9: James and Joshuah (because every season needs a gay guy, and he's probably the best one recently)
season 10: Dan and Ollie (because Dan totally owned Ollie and it'd be fun to see them together again)
season 11: Russell and Ronnie (because what wouldn't be great about having a rat and mongoose in the same house again?)
season 12: can't really say yet, but I think Enzo would fit the bill.
The problem about the last All Star season is that each season too easily aligned with themselves. I'd like to see a pair from each season that absolutely despised each other in the house.
edit: I just realized I have way too many males on this list.
