I had a similar situation when I owned Magnepan 3.6R's, the mids and highs were great but bass was lacking, even after adding a sub, and the room needed to have them sound great was a problem.
I have since got a dedicated room for audio however the speaker that I have gone to with absoulutely no regrets is the B&W Nautilus 800. They are 16k new, close to your budget. Clarity, presentation, soundstage is all fantastic. I feel these speakers are every bit as detailed as the Magnepan's were with killer bass extension. Stereophile reviewed the signiture models, exactly the same except for a $4000 additional finish. You can find the review on their website in the archives.
I have since got a dedicated room for audio however the speaker that I have gone to with absoulutely no regrets is the B&W Nautilus 800. They are 16k new, close to your budget. Clarity, presentation, soundstage is all fantastic. I feel these speakers are every bit as detailed as the Magnepan's were with killer bass extension. Stereophile reviewed the signiture models, exactly the same except for a $4000 additional finish. You can find the review on their website in the archives.