I consider launcher pro one of the worst ones actually.
All the famous launchers mentioned above should be considered.I personally love (and thus add) 91launcher (free and very rich of themes and options including gestures,transition effects,folders and many more,all free) and 360 launcher (also free but some themes aren't,but for registered users every week they donate some of them).
For simpler ones an alternative to holo (always good) is baidu desktop that contains also folder possibility and some simple but beautiful themes.
Finally for famous ones i got free (with app free of the day) next launcher and it seems to me much better than go launcher free (it uses less battery and it is much more fluid but it is a paid launcher,price seems depending on country),i add it to the other famous mentioned.