Which Speakers should I build?

For me, some of the impetus of the micro tower build was that the Pulvia 7HD was on sale at Madisound and I had some Plywood.

The CHN-110 is just a little more expensive but it would make a much bigger tower. I built the 18L BR cabinet from the Mark Audio site
I think the Kewel, also on Mark Audio's site, is a better one, or a Pencil. this driver really ask for a TL alignment I think. I use it in an own design TL that is very similar to the Kewel. The 18L reflex on the site is tuned way higher than it should (to make the box small). If you want a reflex I would more double the size to ge the right tuning. But my design TL goes to 31Hz, and the Kewel is only tuned a little bit higher by Scottmoose (who is the designer of most on that site)...