Your request is unreasonable. The Dell Ultrasharp series is famous in this forum for having an impressive quality to price ratio, so any monitor better than the U2410 is almost guaranteed to be more expensive.
The U2410 is already 8-bit + A-FRC to simulate 10-bit color. TFT Central's panel parts database lists one 24 inch panel that looks better, with true 10-bit color and an RGB-LED backlight, the LGD LM240WU5-SLA1, used in the LG W2420R and the HP LP2480zx, but those are both over $1500.
No official review? What's this then: http://www.hardwarecanucks.com/forum/hardware-canucks-r...
Also, from what I can find, the Asus PA246Q might actually be using the same panel as the Dell U2410. The slightly lower price is probably due to the PA246Q lacking the component and composite inputs of the U2410.