Personally, I find the Marmot Trail Wind Hoody to be breathable enough, and I very much like the mesh pit vents. I also find the fabric plenty durable for its intended purpose. I have been using mine for a few years now without incident, but I certainly wouldn't feel comfortable rubbing the fabric up against granite for any extended period of time, as Eric mentioned above.
I have never used the Houdini, but I'm sure it is a great windshell along with the Squamish jacket that the OP has.
I simply haven't been dissatisfied with my inexpensive Trail Windy Hoody in any meaningful way (other than the fact that the DWR wears off quickly, but this seems to be the case will all DWR coatings I've ever had experience with), so I've haven't felt compelled to replace it with something more expensive.
Anyway, glad to hear the OP likes his windshell even more now that he is confident he doesn't have to trade it in for some younger, lighter shell :)