Here are the Head Speed Pro men’s shoes. I noticed these in my latest issue of Squash Magazine.
These are non-marking indoor court shoes even though the soles are dark. I think these are marketed towards tennis players but they should be good for squash as well. Also check out the Head Speed Pro II, which is non-marking but has the familiar gum rubber-colored sole.
This black and orange model looks pretty sweet:
And here’s a white version that also looks nice. I could only find this in the US: