Go to harbor freight and get this for $120:
http://www.harborfreight.com/cpi/cta...emnumber=98357
I have one and it works fine... You may want to invest in a better slide hammer tho, the one that comes with it sucks and slips off after 2-3 pulls. Just grind down to bare steel whee you put the studs, start in the lowest point, and dont overpull. If the panels get a "can" effect where it easily pops in/out just heat it up and cool with a damp rag.
Wish I had pics of the door before... it was creased on the curve along with under the molding was caved in around 1/2". Pulled, light coat of filler. 1st pic there is a light coat on the bottom not blocked yet.