YZ, if your rim is out of true (ie; side to side), then it can be repaired. If it is actually dented, then I would not recommend "bending it back" as this will effect strength negatively. The Excel rims are supposed to be both stronger and lighter than stock. As far as costs, you would have to check with your dealer, but they ain't cheap ;) I personally like the black rims, although they do get scratched from tire changes, unless you are very careful, but this would be true of powder coated ones too, probably more so.
Hope this helps,