SpectraView is a hardware colorimeter used to calibrate the monitor to make the colors more accurate. I opted to just get the standard 2690WUXi w/o SpectraView 'cause I figured I might be able to borrow a different colorimeter from a friend who works in the IT dept of an advertising company. Still waiting to get it.
From what I've read the with factory presets the 2490WUXi and 2690WUXi are merely "okay". Using a colorimeter vastly improves color accuracy. Visually looking at my NEC, the colors looks pretty decent, but I know it can look better.
FYI:
Based on what I've read people recommend the 2490WUXi over the 2690WUXi because of fewer flaws. Such as few issues with backlight bleeding, better default color accuracy (but not perfect), reports of some minor, but visible image artifacts when doing highly detailed graphics editing. That would be something a professional graphic artist would see more easily than the average person who would not know what to look for.
Since gaming is your primary concern I don't think getting the SpectraView version is worth the extra $$$. I use the 2690WUXi most for general purpose usage and some gaming.
I think NEC will be releasing newer versions of the 2490 and 2690 in the "near" future which uses LEDs instead of florescent lamps for the backlighting.
From some preliminary research I read about LED backlighting they are supposed to be able to produce up to ~140% wide color gamut. The average person, that will mean nothing except that colors might look a bit "weird" because until just recently most people were used to 76% color games LCD and CRT monitors. The 2490 and 2690 has 92% wide color gamut. Professional graphic artists cares about very wide color gamut because they produce truer colors especially on printed material.
LEDs should also cut power consumption (a minor thing) and run cooler than florescent lamps. But more importantly they should also provide better blacks or real black. The LEDs are grouped together in local grids so that sections of the LED backlight could actually turn off, thus providing real black when necessary. Your typical LCD monitor can't do that 'cause the florescent lamps stretches the entire length from left to right.
As you can guess LED backlighting will be very expensive and will remain very expensive for some time until the production process can be streamlined. Samsung released a 20" LCD using blacklighting during the summer, the selling price was $3,000.
If you are in the market for a LCD HDTV (who isn't since SDTV signals will terminate on Feb 2009), then you may want to consider Samsung's LED backlit LCD HDTVs. I've seen one at a local Best Buy; it looked really, really good. Better than most other LCD HDTVs and also more expensive. See the link below:
Samsung - 40" 1080p Flat-Panel LCD HDTV - LN-T4081F