The different flavours of Windows are disliked by consumers, and liked by corporate customers. The answer is clear: just have one 'consumer' edition and stop selling both Home and Home Premium. The rest- Professional, Ultimate, Enterprise, etc. are all fine.
Pet gripe: I wish people would stop saying that OS X costs $29.99 and that Windows costs considerably more. They both operate on considerably different models- OS X is released once per year, Windows much less frequently (and with service packs).