[ekky]

he has to get to the river first.

Also it doesn't matter how much he is in for... thats gone.

All that matters is how he equates his pot equity, and whether the pot is laying him the correct price. If so, call, if not, fold

too many people say to themselves *oh well, I already put this much in, I mite as well put some more in* when its an obtuse way to look at things

To the OP, Id raise the flop a generous amount, and then re-evaluate on turn.

In this situation, Id be tempted to chuck it away on the turn.

The fear of MP3 raising again, and then you folding is too real to commit 2400 chips to the pot with no assurance of even seeing a river.