Holo launcher is a nice one imo. Alot of people also like Nova launcher. Then there is Apex launcher another very good one. I haven't used it but the thread likes Action launcher so I might just try it also.
I use Nova prime. I held off for a long time on buying prime hoping it would go on sale... But it never did. I really like some of the gestures in prime like swiping down from any height on the phone brings down the notification shade instead on having to slide down from the top. I use action launcher on my tablet. I dont think I'd like it on a phone tho.
I was using go launcher and nova launcher until I found Themer. The other 2 have way more features but the elegant simplicity of Themer really works well for me. The themes are the most unique and beautiful of any launcher out there and they are putting out 4 or 5 new ones a week. It's a great choice if you want simple. Not a great choice if you want configurability.
I try launchers quite frequently. When I got my x I was planning to use the Google now launcher but five minutes later I was back to action launcher. I also liked smart launcher but action launcher is my favorite for my x