If I were to guess... the first one and last one are both using brown cherry switches, the top one has english keys, the bottom one has english w/ korean keys. The "click" model has blue cherry switches and the "linear" model has black cherry switches.
Currently I have onboard sound with the ALC889a chipset and I primarily use my headphones for 90% of the time I'm at the computer. The onboard sound will downmix surround sound sources (quad, 5.1, 7.1) to stereo, but the virtualization is non-existent (can't tell the difference between front...
Sounds like input lag. Essentially when a monitor displays an image from the video card there is an intermediary step where the signal is processed. On CRTs this step is near-instantaneous on LCDs not quite as fast.
This website suggests that the input lag for your display is quite good though...
I bought myself the 2343BWX on boxing day and I really do like it. The screen size and resolution work out to be about 100DPI yet the screen is extremely easy to read. Everything I've tried so far supports the resolution (Valve Orange Box, Dragon Age, DiRT 2, Modern Warfare 2, Supreme Commander...
I've recently encountered the same problem on the GA-P35-DS3R, my theory is that its noise from the PCI bus or EMI as atleast in my situation the Azalia codec is placed directly beside the PCI-E 16x slot. I found one way to improve the problem is changing the output from "Headphone" to "Front...
If you aren't dead set on using WMP, I'd suggest trying out VLC Player, it plays virtually everything under the sun and requires no special codec packs. It also has a nice minimal interface.
Instead of the G80 GTS I'd go for the G92 GTS, less ram, but faster overall and $10 cheaper.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130312
Also the onboard sound is probably better than that card you got chosen.
As for the Hard drive, I'd go a lot bigger than 160GB, newegg...