I'm not quite sure I understand all of the limitations of your setup, so this recommendation may be qualified. The Wisdom Audio M 50's like the above Bohlender's are a true line source speaker. The dispersion patterns are radically different than dynamic drivers. Although your setup will compromise imaging somewhat I think the dispersion characteristics of a line source would serve you better. I own Avalon Radian HC's and Wisdom Audio M 75s. With the Avalons I needed a full complement of ASC tube traps and wall treatments. With the Wisdoms I only need two tube traps in the rear. The electronic crossover gives you almost unlimited flexibility to fine tune the speaker to the room. The M 50 is a one piece design which uses a 50" magnetic planar driver sitting atop a 12" underhung woofer. I like this speaker line so much I became a dealer. If you've got the bucks this is a phenomenal speaker. The other good thing about this speaker is that it is so revealing and transparent that every improvement in the rest of your system will be apparent. The down side of the speaker is that it is expensive and it must be biamped. Fortunately though you don't need a ridiculously expensive amp on the bottom, just one with high current capability. Happy hunting.
Speakers recommendations when placement is an issue
I could use some help with speaker recommendations-I am restricted to placement with speakers flanking a 6 foot built-in entertainment center and 1-2 feet from the back wall. Currently using Linn LP-12, PSE electronics, CAL Icon MK II. Want to start the upgrading process with floor-standing speakers, however, because of limited placement I don't want to waste money on Avalons or ProAc if I can't make them sing! Any speakers that can provide good sound in this setup? Budget is fairly open. thanks!