I have 3 DX Rhynos, 1 for putting and 2 more for practicing. I also have a Champ Rhyno for driving, as I always cringed when I drove a DX and it smashed a tree.
As for advice, we all know it's personal. But I think what you have to figure out is rim preference, as well as stiffness. I love the Rhynos rim and the DX stiffness, but I'm still really trying to figure out how to putt it to take full advantage of it. Sometimes I'm golden, other days it's embarrassing. I too have tried a multitude of putters: Dart, Magnet, Ion, Wizard, and now Rhyno. In the great words of Nike, Just Do It. Pick a putter and stay for a while.
I'd recommend going with a base plastic (because of price), get 3 or more around the same weight, and just keep practicing, that's what I've done. Good luck!