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I am going to try using Rust-Oleum 7250830 Metallic Spray, Black Night. Has anyone done this? or tried a similar method?

Does anyone know a paint that would match the above for spot painting and/or fixing mistakes?

Advice please.

Yikes!
That is an enamel paint so you would be pretty much committed to that.

If you really want "Rust-Olleum" I would suggest one of their specialty paints:
http://www.rustoleum.ca/product-catalog/consumer-brands/automotive/paints-and-coatings/high-performance-wheel
Maybe go for the graphite shade?

I would also strongly suggest not going to a "pure" black.
I usually start with what is commonly called "Payne's Grey" which is black with some blue in it.
It gives the impression of the gun metal bluing you may be looking for.
Maybe Krylon? http://www.krylon.ca/products/colormaster-stainblocking-primersealer/ Black?

ANYWAY, the only way to get a good match is to get the same paint from can / airbrush / hairy brush.

I would suggest Liquitex where they sell the can and the paint.
http://www.liquitex.com/spraypaintfeatures/
The 3599 Neutral Gray maybe?
I am sorely tempted with their "paint markers" but I suspect that may end badly.