This is newer: Subjectively Speaking: Catcher Framing Runs, Part 1
Its probably impossible to place a value on Butera at this point. But what we can say with a high degree of confidence, I think, is that Doumit is bad, and possibly really bad. If Butera is even average, then the difference between these two overall, at least starts to approach zero and may even favor Butera.
The other, and perhaps more important part of the Doumit-Butera equation is the fact that Doumit is useful otherwise. When Butera isn't catching, he's less useful than the Gatorade jug (his relief pitching stats notwithstanding). Doumit DHs, and is valuable there. He can also play outfield in a pinch, although I hate to rely on him to do it. And when he isn't playing, you can put him in in the 8th or 9th inning as a pinch hitter and not want to kill yourself.
If it's strictly catching we're talking about, the balance is far closer to be sure, but Doumit is head and shoulders above Butera as a whole player.