No, do not trade CJ for guys like Cutler or Flacco.
You need at least a Vick or Newton type to do this. If you settle for a Romo or a Maning, you should also get back a decent WR or RB.
Do not sell CJ so cheap! Think of who you could have drafted at QB instead of CJ? I think he was a top 5 or 6 pick in every league that matters. Johnson for Brady straight up is close. Johnson for Flacco, not close.