Just an interesting historical note: Speedplays were originally aluminum. I had some. But they switched to steel pretty quickly after because the aluminum wears so fast.
I think there is a limit to how light you can reasonably make something before you really do just value a little more reliability.
Of course I switched from Speedplay Zeroes to Dura Ace 7900 this year, so I am obviously not obsessed with weight.

Based on Sugarkane's response a couple of posts up, go for the offerings from Dulight. From the picture they even have the lip on the bowtie that Toronto/Jersey bowties lack.