There is no best sandwich effect. You have to understand that there's no such thing as a best of. Looking for a best of, a quick and easy fix, will not get you the best routine you can find.
I have to say first of all, I just simply don't like people coming out and wanting "the best" all the time - because guess what - these shortcuts don't get you the best.
In all honestly, looking for the shortcut by asking for "best of" effects isn't gonna do you any favours, and 95% of the time will not get you the most hard-hitting effects you can perform. That's right, asking for good tricks will actually, the majority of the time, get you tricks that, when performed by you, will be second rate and extremely common. So you'll be performing the same old stuff and probably not as well as you could be.
Rather than ask "Where can I find the best effect", ask "Where can I find effects", go out, look through everything, and find what works for you. It normally turns out that no one effect is the best - but rather, that you will create the strongest effect that you can have through a mixture of everything you've researched - even the ones that may not be the first named because they haven't been released on a DVD in the past 5 years. You want average material, ask for "the best" sandwich effects. And if you're satisfied with decent, go ahead. You want the best sandwich effects, if you actually want the best triumphs, which has the highest possible impact? You'll have to work harder than that.
There are so many sandwich effects, it is impossible to list them.
Daniel Madison has several - Catch, Cameo, Half Vanish are the ones that come to mind.
Aaron Fisher has one called A Simple Sandwich.
Jack Parker has something of an interesting sandwich which is off the beaten path called Cross-Eyed Surprise.
Tyler Wilson has one called Dirty Stinkin' Ape in the Middle.
The most important thing is this: Once you learn as many as you can, and learn when to use what, then you'll have the strongest sandwich you can possibly get. That's what you have to do if you want the best.