What are your favorite solutions for speakers under 2 cubic feet, 6 cubic feet, 12 cubic feet and 24 cubic feet?

The first two can be used in most homes, the second two in clubs and theaters, and maybe some home applications.

Same questions, but with budgets of $200, $1000 and $5000.

I don't care to address the over $5000 or unlimited class because the answers become outrageous. It then takes the form of do it all and make the whole planet into a giant hifi. Of course that leads the next to say, why stop there, use the solar system, the galaxy, the universe...

But if you can think of something really cool that's a little bigger or a little more expensive, please do tell. Just no fair turning the discussion into one-upmanship. I'm looking for real solutions. What are your fav's?

How 'bout your favorite implementations for single drivers, two-way's, three-way's and multi-ways?

Your favorite woofer? Midrange? Tweeter? Based on price-performance, specific applications or outright.

This ain't a competition, I'm just looking for opinions.