It's personal preference more than anything.. Some people like to run at lower resolutions and have their edges smoothed/blurred with anti-aliasing and some people prefer to run at higher resolutions and not have the smoothing/blurring effect.. The Anti-aliasing smoothing can cause very thin lines in the distance to "break apart" into different segments making thin lines and thin wires look discontinuous or fragmented from running too much anti-aliasing (but they will look very smooth) and not enough resolution.. Running at a higher resolution, you will have more pixel samples of a thin line, but it will still look jaggy without anti-aliasing but it will be continuous. Again, it's all personal preference, but I prefer high resolutions with 2X or 4X anti-aliasing than low resolutions at 8x or 16X CSAA/AdAA.. Of course, high resolutions are not always possible, some games simply don't let you crank the resolution up that high and monitors that support high resolutions are quite expensive.
For LCDs, you should always run at their native resolution.
Onboard RAID vs. 3Ware RAIDI never recommend people run RAID-5 with onboard chipsets.