Hull, Watford and Boro. Unlikely though since Cardiff will go up and Boro are fucked.
Hull - away game
Watford - would make rest of the Championship bitter as fuck over Pozzos
Boro - again, local away game. They don't bother me at all tbh.
Also I reckon all 3 have more chance of being cannon fodder for us than the likes of Cardiff, Forest, Leicester, Leeds etc who would strengthen and potentially establlish themselves in the top flight.