Is it worth it?

One of my favorite small monitors is the Sequerra MET-7, designed by audio guru Richard Sequerra. Warm but revealing, outstanding soundstaging, etc. You might want to augment them with a subwoofer, but during the years I owned the MET-7's I had no sub, and didn't feel terribly deprived.

The MET-7's have had only a few audio reviews written about them, but all the ones I've seen going back to the mid-1980's have been laudatory (Harry Pearson, founder of TAS, give them high marks). For more info about the Sequerra MET-7, go the the following link:
http://www.sequerra.com/electronics/data/index.html

If I were stuck in a small room, I would try out Audio Physic Sparks, proac tablette 2000 signatures, Gallo Nucleas's, or Reference3a MM Decapo
The sparks are very clean sounding with amazing imaging. They are also small enough to slide back against a wall when not in use. Small, and floorstanding.
The proac tabs are a little more laid back, but will mate very well with ARC electronics. Very small.
The gallo's are futuristic looking and have tremendous imaging.
The reference3a's are a two-way ported monitor with no crossover (just a capacitor). They do well against a back wall & have amazing resolution. One of my friends just loaned me his set & I am very impressed with them.

I have also heard linn speakers (nexus) sound good in smaller rooms. You should look into some of the british manufacturers. Their speakers seem to be designed for placement in a smaller room & against a wall.

I'd second the ProAcs--they are fast and accurate, and don't try to compensate for being monitors by bloating out the mid-bass. They are also voiced with ARC electronics, so a good match with what you have. I loved the sound of my Response 2s with my VT100.