Yes, I'm familiar with the Kenosha Potato Project
And yes, some potatoes are "better" for one thing and others for another thing... russets are better for baking, and "white potatoes" are better for making potato salad, for instance; but pretty much all the ones I've ever grown or bought can be boiled until tender, or baked or tossed into the microwave, and be perfectly fine; it's more a matter of paying attention to the timing. And especially with new potatoes, they have so much more moisture inside than older ones do, they just need less cooking.
But, if you've tried $300 worth of seed potatoes, I would think you could give us a bit of a rundown on your faves for the various uses?