The frame looks great though and its for sure something that can be done at Cole Coatings.
With regard to the dent, the method used can in some ways be dictated by the dent itself. Dies can work, filling can work, sometimes we spot weld a pin to it and simply pull the dent out. It all depends.
It's one of these, though not this one.
It also has a dent in the top tube I'd like to remove, preferably with a die rather than just by filling. Have you ever used these?