So, I was planning on renting a D700 to shoot a concert tonight, but all that's available is a D3x - no D3, no D3s - which is annoying (though my own fault for reserving late). After all, I'm not wild about the prospect of throwing down an $8k deposit, and low noise at high ISOs (I typically stay between 1600-3200 in bad lighting) is far more important to me than a 25MP sensor. However, the lighting at the place I'm going is sure to be terrible, and my current camera (D300) is woefully weak in high ISO settings. Does the D3x's high ISO noise reduction, though inferior to the D3/D3s, outstrip the D300's by enough for me to merit renting it? Any thoughts are most welcome.