Keep in mind, though--as the Chief pointed out in the "best press" article, when a trainee becomes proficient enough at one-arm pushups, the drill becomes much more of a gut worker than an arm/chest/shoulder builder any longer. I can also personally vouch for this one.
By all means, master the OAPU. The tension generation you acquire from doing so is priceless (the oohs and aahs from the cardio bunnies is a bonus). I firmly believe it was diligent work on this that bagged me my first one-arm chinup, and I hadn't so much as touched the bar for weeks at the time.
However, if you're determined to bench and your OAPUs aren't yet at the point of diminishing returns (I'd suggest when you can do more than 10 reps each arm with perfect Naked Warrior-form at a three seconds concentric/hold for a count at the bottom/three seconds eccentric, find yourself and new pushing exercise and simply practice the OAPU on occasion to remind yourself you can still do them), I'd recommend some block training. Two weeks of benching, two weeks of OAPUs and then re-evaluate three months from now.
And please let the forum know when that time comes.