Hello Robert,
No I haven't overclocked my 580 yet. Still struggling with my 2500k. I know this thing has more to give but haven't had enough time to research much.
The picture quality looks good on the Kuro! Showed my friend Caspian Border on it and it looked..awesome! I was running dot-by-dot in pure mode, optimum and then standard and the black levels blew away my U2410. I wanted to get my panel ISF calibrated (and I really should) but keep putting it off.
I don't know how much your Pro151 differs from my 600A but I had to turn the brightness up in-game a little as the blacks were too black. Some of the darker details were lost. I imagine your Kuro is set up beautifully. But I like 1920x1200 on my monitor though. I save the Kuro for movies and occasionally regular TV.
I'd love to get a bigger monitor. A U3011 or one of those new NEC monsters would be nice. Have you thought about playing BF3 at 1080 instead of 2560x1600 for the performance increase? 1080p seems almost as nice as 1200 for me.
I'd highly recommend an ISF calibration. With ISF modes enabled on your 600, you'll be able to get 45+fl of light output which is much brighter than "pure" mode while keeping your colors perfectly in line with standards, along with a flat gamma curve which means excellent shadow details and no black crush. Make sure you do research on something like
www.avsforum.com for well respected calibrators, esp those who specialize in Kuro's. My Kuro, is only for BR, xbox360 and TV viewing. I do all my viewing in ISF-Day mode. You likely had to turn up brightness to avoid black crush which needs to calibrated out. The only modes that can be calibrated well on a Kuro are pure and ISF. The rest have one problem or another and do not calibrate well.
After messing around way too much, it turned out that the auto overclock (turbo) settings in the bios are as good, if not better than what I could do manually. I ended up with Turbo 4.6ghz on my CPU with the following settings:
All auto
PLL Overvoltage = Enabled
Spread spectrum = disabled
That's it, the rest is auto and it's stable. The nice thing is that this keep all the power savings on so the CPU only spikes when needed.
A 1600p/30in monitor is a blessing and curse. It's great for desktop usage but very painful on the wallet for gaming. It always requires you to keep up with the latest and greatest in video cards. Unfortunately, the scaling on the panel is not very good so it's native res or bust. While I will hook up to the Kuro for testing, playing from the sofa just isn't practical for my setup.
Sometimes, I wish I had a 24inch monitor still for gaming but when it does work out, it's beautiful.