My first thought was that the Silverline Preludes (newer version, $1200/pr new) might be perfect for this application. Wide dispersion, good dynamics, small/thin footprint, good mids and clear and detailed but not harsh highs, with decent bass but not likely to overpower your bedroom. I think the f12s would be a bit much for this application, and I'd be concerned they don't have the dispersion characteristics you're looking for given their wide baffle (read Stereophile review for more info.)
My other thought was to go with good monitors as you can probably get better sound quality per dollar, and the good ones probably go plenty deep enough for this application. And it may help with your dispersion requirements as well. The other advantage is you can buy stands high enough to not have to resort to cinder blocks to raise them up. In addition to the Revel M20s mentioned above I noticed the M22s are also in your price range (used), but lots of others to consider as well. Another possiblity might be the Silverline Minuets that espouse a lot of the qualities of the Preludes in a smaller package, and at about half the price. LOTS of other good options for monitors in this price range -- moreso than floorstanders in my opinion (Ascend Acoustics, B&W, Dynaudio, Epos, Nola, Paradigm, PSB, Wharfdale, etc., etc.). Best of luck.
