For me it would be:
Power Struggle
The Crysis 2 game modes (especially Assault)
4-way team deathmatch would be fun (like in UT'99 or BC2/BF3's Squad deathmatch)
Bombing Run; double domination (ala UT2004), or domination (UT'99)
Onslaught/Warfare (UT'04/UT3)
Conquest double assault lines (Battlefield series)
And that game mode, whatever it was called, the one they used in Red Orchestra (not the simplified version they used in RO2)
Oh and did I forget to mention bombing run again??