Cordova is red-hot right now, but I'm not sure I believe in him enough to make him the choice. I'd probably go with Beltran. I just did. I actually like Juan Gone, especially the way he's playing right now. Sosa should finish with more home runs, but I like Gonzalez to win the RBI and average battle.
Steals are pretty much a wash.
In a 5x5 league, I need to replace an outfielder. If all you need is a short-term boost, I'd go with Cordova, since he's so hot right now. Cedeno if you need steals, Jordan if you don't. Owens is always a good bet as well. Penny, Mulder, Daal, Dreifort, Russ Ortiz, Freddy Garcia.