Sound Labs might meet your objectives quite well. Being full range ESLs with prodigious bass, they excel at reproducing piano and many other instruments as well as voice in a seamless fashion. In all likelihood you can dispense with your subwoofer, which could make the cost more palatable, even though Sound Labs are within your budget.
The new panel technology implemented in Sound Labs this year realizes an average of 9 to 10 dB increase in sensitivity and commensurate dynamic range. In a nutshell, a 10 dB increase is equivalent to suddenly having an amplifier with ten times as much power as before, so I wouldn't be too hasty thinking your 150 watt monoblocks can't cut it - in fact I'd venture a bet the Thors would drive the heck out of 'em.
My Sound Lab U-1s are en route to Sound Lab for upgrading, so I'll soon know what others have been talking about - the efficiency increase is one thing, but I'm told there are other significant benefits. Every comment I've heard or seen has been overwhelmingly positive, saying it's a stunning improvement.
For the record, I'm a Sound Lab dealer located in the Chicago area. If you're inclined to come for a listen anytime or just want to correspond or ask a few questions on the phone, feel free to do so.
Brian Walsh