To be honest, even though I feel that Bosh is far and away a superior player in almost every facet of the game, I'm more open-minded about trading him and building around Bargs at the 4.
Why? Mainly Bosh's $18-21 million a year for the next 5+ years at the PF position, as opposed to Bargs' $10 million. The savings are significant; enough, in my mind, to spring for a true post player in that type of scenario, and even have enough left over for a little extra at the guard/wing position.
Of course, the time to do that might've been last year; not sure about Bosh's trade value right now, because GMs aren't going to give up important pieces when Bosh could just leave at the end of the year. And a sign-and-trade means that Bosh would probably have to "OK" the team first, which rules out getting players like Andrew Bogut, Brook Lopez, Marc Gasol, etc. etc.
But really, you know why I probably wouldn't mind doing that? Because Bargs seems (to me) to be the sort of defender that Bosh often has trouble with; long, very quick, and a good man defender. So it would be less likely (again, to me) for Bosh to come back here and blow up all over us and make me feel terrible about making that choice.
(Of course, it would probably be a 15 points on low percentages, 22-rebound game for Bosh if Bargs were to stay at C after he left... so we definitely need that post C

)
FTW!