Looking at your collection, I would suggest these two in order- Iron Man, and Fish Tales.
Both have very easy rules to understand, and both bring the balls back to the flippers via ramps. I give the nod to IronMan, simply because Fish Tales is getting into IronMan pricing territory, and the value isn't there compared to IronMan.
Dracula would be a third option, but the theme can be hit or miss for some, and it truly is a feast or famine game. The feast is amazing, the famine is frequent....LOL