With the price of cascades you might want to use something a little cheaper for the bittering addition, save the cascades for something you can actually taste it in.
Maybe you should sell some of it, I bet you could make a pretty nice profit.
US-05 should work well, I think you'll have a pretty tasty beer there! I've not tried rye malt in a stout, but I've done an ale that is 60/40 munich/rye and it's really good!