It turned out to indeed be the master cyl. Got a nice new one from malloy for cheap, popped it in, and presto! My car works again! I got a speed bleeder for the slave cyl too, makes bleeding a snap. Got em for the brake system too but didn't feel like messing with the brakes today.

civics (and camaros) beware!

Thanks to everyone who responded to my previous post when it broke in the first place.