What? You got your phone today and you want to get rid of TouchWiz right away?
Well, there are some people who just “hate” TouchWiz with the utmost passion but don’t worry, there’s a ROM for that.
The CM-Zoom ROM for your rooted Galaxy S3 GT-i9300 comes TouchWiz-free and bloat-free. You will find the whole ROM weighing at only 200MB (compared to 400-500MB for stock ROM), which just means that it’s mean and lean and will only have the stuff you absolutely need.