The used Platinum Solo's for about $600 per pair have extremely satisfying bass, along with full range sound, and musicality. I have used with 35 watts per channel tube amp, and in a room your size always enjoyed it. I don't know if your amp will definitely allow you to crank it up, as there have been posts by those who stated they needed multi-hundred transistor watts per channel to achieve best performance in their larger listening rooms.
which monitor isn't lacking in the bass dept.?
I will be using audio refinement cd player, and the audio refinement integrated 65 watt amp. I listen to a lot of female voice along with electronic, jazz, blues and even the likes of rage against the machine. I might put on diana krall and the next minute listen to radiohead, so it really runs the gammut. So for the heavier stuff I like good deep accurate bass, but I have to use a monitor because of room size, 15x11x8ft. Or a small floorstander with good bass that won't overwelm the room, I don't want to spend more than 2000$ new or used. Thanx