Funny, I ended up with SourceTree because it seemed like a clean and simple (well, at least when I started with it), but still having all the tools I needed, alternative. Sure, it has gotten a bit more complex, but the basic functionality (as I see it: diff, stage, commit, push, pull, branch management) feels simple to me.

Could you explain what parts of it you don't like? Also, could you link to git gui? I tried to Google it, but didn't really get good results (shockingly, all the other Git GUI programs came up...).