$700? ouch. I might just go to a yard, pick up a door and just have it painted to match. i've had the inner door panel off since the accident--the structural member isn't damaged at all. in all seriousness, i think a few good punches from inside will pop this dent right out; and the rest can be done with body filler. i'll go for some estimates thoughthe dent in my door was creased at the front structural member and the paint was pretty marred up... so no chance of clean repair. As far as the cost... they replaced the door and painted and mounted... I figure 6-700 bucks just for that.
a little side note: i suggest you get some edge guards to prevent the paint from chipping off the doors. they saved my butt more than a few times