I've been working on one for my home theater for the past few weeks. Here's a link to my project so far:http://episteme.arstechnica.com/eve/...1#929002883631
I"m using an Adire Shiva driver with an amp from Parts Express. There's a bunch of information in that thread, but please feel free to ask me any questions if you have them. I'm almost done painting it now and am just waiting for the driver to arrive (currently on backorder from Adire).
A great website to check out for parts and kits is Acoustic Visions
. Very friedndly and knowledgable, and is a real time saver if you don't want to build the enclosure yourself.