Honestly, what kind of question is this....
Imagine something more serious - I am a doctor, and I perform surgery in a few weeks, any of you guys recommend the best incision? So, perhaps magic isn't as serious as cutting someone open....but really dude, you should already have a concept of what material you are goind to do.
You are going to buy a DVD, and have down your own patter and perfect the method in a few weeks? Garbage.
I would say - do something you have been doing for awhile, and do it well. Vernon said, "Do one thing better than anyone else, and you will be remembered", more importantly, do something good to start and they will want to see more.
So this brings me to my next point - a more important question is: What would be considered good criteria for an opener?
For me, I want something that is solid - that can't be caught even if they try their hardest. This will set up the..."you are wasting your time burning me" concept for the rest of the set. I want humour and a few jokes involved in the opener....and I want it to be strong - very strong....almost as strong as a closer. In short...which is odd...because this post is long-ish, anyhow, I want my opener to represent all of what I am about to offer - if they only see that effect, they would be able to know my magic and my personality.
Hope this is of more help than naming an actual effect to choose.
On that note - Chr!s, if you are doing CCC by Hooser, and feel that it is easy...you may not be doing it right. I thought I was doing it right too...until I saw Troy do it, and realized how truly skilled it could be, when convincers are added. Great effect choice though, but I wouldn't say it was "easy".