I'd like to know this as well. Apex and Nova are great in regards to providing extra functionality with the vanilla ICS look and feel. However, it's always fun to try something new.
This is likely old news but ADWLauncher EX is a great ICS launcher that even works better on tablet. I use it on my Transformer but might be worth trying.
All the talk about Nova piqued my interest so I abandoned Go Launcher for a couple of weeks to give Nova a try. I found it laggy and without the custom widgets that made Go so much fun. I switched back to Go last week. Lag is gone.