List of my preferences for horizontal pushing:
-incline bench press w/ dumbbells.
-Cable press (similiar to a cable crossover but pressing rather than a fly).
-ring pushups - variations - weighted, feet elevated
-pushups- I skimmed Gregs article really quickly, and to add onto there: band pushups, chain pushups, pushups on a stability ball (I find these can be hard on my wrists after a few sets though).
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."