Proac's as someone mentioned already.
AudioNote AN speakers are all stand mounts and the AN-E's go very deep indeed (effective bandwidth from 18 Hz to 23 kHz at -6 dB) The smaller AN J's go to about 25hz If your patient you can get the AN-E Lux in your price range and the J's are new starting in your price range.
PMC have some very good small speakers with transmission lines that go fairly low as well.