I've been in 2 minds about Santa Cruz. However, as we get closer to Jan Im becoming more in favour of signing him. He adds a new threat and can hold the ball up. Infact Cruz, Owen and Bellamy all would add different threats
Cruz = Aerial ability and hold up play
Owen = Poacher
Bellamy = Pace in behind defenders
I'd be happy going into the remainder of the season with those 3(or 2 of), plus Caciedo and Sturridge. The worry is all 3 are quite injury prone
Concerning Santa Cruz, it's just a pity Petrov is out. He'd thrive on his service.