If you can't wait, and don't mind dropping the coin the KSD VV might be a reasonable option that will fit the stuff you have. It will at least give you an idea if a voltage change makes any difference to you.
Otherwise, it honestly looks like the ego-twist is an awesome option as soon as it is released. I would assume the booster sales will drop and prices will lower on it, if it works as well as it looks it will.
I have a coupld KSD VV's, a lavatube, and I am surely going to be picking up one or 3 of those twists.
ps. and I am cheap lol