I actually hit a curb for the first time in my life about 8 months ago. And man I made it count, I made that curb my bitch. It was a very weird and oddly tight intersection and I scrapped both right side wheels (front and back) pretty good. I got quotes of over $100 to have it repaired (each wheel). Seeing as how the wheels are only $175 or so new, this was crazy expensive.

Anyway, I have a Dremel and so I hit them with that and grinded down the damage to smooth. It was pretty bad originally. Then I hit it with the polishing compound that comes with any standard Dremel kit. After, the wheels look fine and you can't even tell they were ever damaged unless you are looking at the wheels from a couple inches away. Even then, you have to really search for it. Since your wheels are black this will be more of a challenge for you then mine since mine were polished so there was no reason to paint them or anything. My suggestion is to leave it or buy a new wheel unless your are confident you can color match decently. You could easily repair the damage yourself and have it smooth, but respraying it to get a good color match will be the hardest part. If your wheels are more matte finish its probably easy to color match. Color matching gloss to gloss can be pretty difficult without respraying the entire wheel.