I take hommage with anyone who uses a "choke" maneuver. It's sickeningly hypocritical, and allowing wrestlers such as Tazz to use the Rear Naked choke tells me two things: 1) WWE is totally unconcerned about consistency, as referees continue to administer 5-counts for chokes done face to face (a la classic Undertaker), and 2) the WWE is genuinely scared of how UFC and MMA have erroded their fan base and tried to combat that by taking a very minor maneuver from MMA and allowing a select few to use it as a finisher.
Here's one more idea for Khali - I am not sure ifthis move has been used in indies before, but I saw it written somewhere once and this is how I envisioned it - wrestler hooks the head of the opponent under their arm like a Slop Drop or Reverse DDT (opponents face turned upwards into armpit with back bridged) and the wrestler executing the move lifts the opponent up into a reverse suplex, holds them, falls backwards effectively slamming the opponent's midsection and face into the mat. Since the mid-section of a person's body is known as the "Solarplexus" the move was coined "The Solar Plex." At Khali's height, I think the move has even more creedence.
For me, the jury is still out on Marella until I see more of what his style is - high flyer, high impact, or submission. I again give a vote to the Texas Cloverleaf or the Crossface Chicken Wing, but if Marella is more high impact or high flyer, there are a litany of choices.
I leave you with one final note - one of the greatest wrestlers in history to never hold a world title is one Rowdy Roddy Piper, and with the exception of a brief time using the Sleeper Hold, he listed his finisher as "anything that comes to mind." Then again, maybe that is why he never won a World Title.