Trebuchet and Nova are very similar in terms of looks and use, but I'm not about to tell you which one you should use. Any of Nova, Apex or Treb are good each with advantages over the other. They all play together pretty nicely, allowing you to port your settings between them with ease so they all feel the same if you decide to switch between them.
Had a look at Nova but I think I'll just stick with the launcher that comes with Cyanogen, Trebuchet I think.
Have to say from this sale my best purchase was Nova, with Dungeon Village (huge fan of Kairo soft here) and ME Infiltrator close seconds.
Could you imagine how much money they would make if they had a regular sale every week?