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According to Wiki, the WOW transmitter required a few gigawatts: way beyond human capability at the time it was received but not, I feel, beyond the potential of a pulsed laser with its own power station. Maybe we should go for it. Or maybe not!
How about making a small black hole and sending it into the sun.
While Jupiter isn't supposed to be large enough to sustain fusion, what would happen if one detonated a large H-Bomb in Jupiter's upper atmosphere? Could one create a large flash of light? Of course, it wouldn't necessarily indicate intelligence, but might draw attention to our solar system. Would the flash be repeatable at a regular interval?
Inject large (very large) volumes of a specific element into the sun's atmosphere in order to change its spectroscopic signal. Vary the element and the duration to code your message.