I've asked a similar question in the Multi/Digital circle. I'm not sure what your musical tastes are, but I will be checking out the Athena AS-F2s for a second system. They are cheap, full range and around 93db.
I have a modified Scott tube integrated that is 20 wpc and I also picked up a little Sonic Impact for a small room in the basement.
I'm driving Meadowlark Kestral Hot Rods (89db) with the Scott and it is a great combination. A little polite perhaps; great for jazz and classical but not always dynamic enough for rock and blues.
I've recently become interested in single driver designs, but have to learn a little more before taking the plunge.
Keep an eye on my 'Speakers for Sonic Impact' thread in the Multi/Digital circle, something may pop up there.