Most detailed speakers in 1K range?

Try the NHT 2.5i's (but I'd stay away from the older "non-i" versions). They're quite detailed, and have a pretty good reach into the bass as well. The NHT's are definately not for everyone -- they can easily sound a bit bright or scratchy or harsh or "too detailed", especially when driven by "very detailed" equipment. They also have a pretty small sweet spot. Nevertheless, I'd recommend listening to a pair. Can find them on Audiogon for $750 and up.

Used B&W P5 or P6

Used B&W P5 or P6

ACI Sapphire III, it can be purchased as DIY kit

Try Apogee, for example the Slant 6, Centuar, or even better, the Stage. Astonishingly open (especially the Stage & Slant 6), requires a fair amount of fussing with cables & room position as well as a GOOD 100 watt amp but worth every penny. Good luck