Taxi is good, but I would have to put Pinbot above it. The multiplier points there can make or break your game, and it fufills all three options the OP mentioned. You might even nail the shot with a well assisted nudge to prevent the ball from rolling back down the vortex. Not necessarily a gimme on finding the sweet spot of the plunge.
I find Maverick to be a good contender, because so much rides on the skillshots: Amount of multiballs, mini-games, super pops, and points. It can really be a game changer.