I did not like the powerhouse at all. I found that it would wobble on a strong power stroke everytime. IMO if you have good technique in your stroke you can get more out of a smaller blade. I now use a 0degree player for everything that I paddle, including creeks and I've never been happier. I will be getting a foam core blade for next season however, to limit the wobble effect even more. But I will still opt for the smaller blade.
As gh stated you can order any offset you want from Werner no problem and I would be surprised if they didn't start offering the zero degree as a standard option soon.
Bring on the Zero degree revolution!