Atomic 4 paint, cheap!
I don't know if any of you have figured this out yet. I doubt that I'm the only one, but for those who might not have found it, I lucked into the perfect budget paint for A4s, at Lowes. It's a high heat Rust-o-leum in spray cans and it comes in the perfect copper color. It's so close that when I changed fuel pumps, the new one was painted with the original paint and it matched the Rust-o-leum very nicely.
I painted my engine last spring and it has held up well. One of the things I noticed about some of the Atomic 4 paints available, is that they required a coat of Rust-o-leum under them. Plus I've used standard Rust-o-leum on many engines, but I would usually use a Bar-be-que black for the high heat areas. So this find was much better.