Dent Trouble

You do not need a new panel. Looks like that is the 1/4 and you have backside access.

Most of that should come out through the careful use of a hammer, dolly, body file and a bit of shrinking (by guess is that it's stretched.)

But you need to know what you are doing.

This guy on Youtube has some videos can help point you in the right direction.

[ame="http://www.youtube.com/watch?v=LdLDOkEPFgA"]car dent repair (No filler) training - YouTube[/ame]