Counterfeit by Wayne Houchin is one of my all time favorite effects, it requires some sleight of hand, but it's not overwhelming by any extent.
This is a VERY good choice, though not on your list.
Odyssey is not too difficult, and it is an amazing looking effect when done right. Like most things, easy to do, but it will take time to perfect.
Invisible Card is much less visual, but is just as impossible. It hits people in a different way. You predict something you could have never known in an incredibly fair seeming fashion. Crazy little miracle.
Sub Rosa is less of a trick and more of a tool. It has many uses, and is a very valuable asset once you learn it. Not visual in and of itself, but it can be used to pull off all sorts of miracles. Imagine being able to deal yourself a royal flush right from a (really) spectator shuffled deck. Once you know Sub Rosa this is one of countless things you could do with it.
Hope this helps!
// L