I would almost certainly repair that fender... Get some hammers and dollies and work that puppy, you will be able to get that fender into good enough shape that you will need very little filler....

If I were having a serious lazy mood I might order a replacement,,, but that fender really ain't in bad shape....

 

Just another concideration, The repos don't have a hole for the antenna. I would try to save it.

 

I don't see anything wrong with that fender. I would stay with the OEM and skim coat it. You remember how that re pop quarter fit? As long as it's not eaten up with rust on the back side I'd definately re use that one.
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+1 for fixing it. Get the hammer and dolly out and get it as straight as you can.