I've heard good things about Archideck -- my neighbors used them and were very happy. However, I would not use composite decking if I were to re-do my deck. Aside from quality issues, it apparently gets BLAZING hot in the sun, to the point that it would burn your feet if you walked on it barefoot. My brother and his wife put it on their deck and regret it now -- you have to be very, very careful if you have small children, that they not walk on it without shoes. Then again, if might be a different story if your deck was in the shade.
Good luck!