I don't have a lot to say on the range of enhancement settings, other then stay away from the maximum end of the range. The best setting is really a personal preference, but I can give you some starting points.
For 2D/3D Noise Reduction: I use 3 since I see a slight improvement without artifacts. For Noise Reduction, we believe it is "temporal" up to about 3, and then the "spacial" noise reduction starts to kick in. We don't know the exact point where spacial kicks in since the manufacturer has never told us. Temporal noise reduction should not affect resolution much, but spacial noise reduction will. I think the optimal range is 3 to perhaps as high as 6, with 6 starting to show some resolution reduction.
For Mosquito Noise Reduction: I use 3, and think 3 to 6 is also a good range to try.
Block Artifact Reduction: I leave this set to 0. This control is to improve horrible video quality. Don't watch horrible quality video sources.
Sharpness: I use all six settings at 3. I think the reasonable range is 3 to 6, but have heard some people using up to 10. You may start seeing some artifacts as you get to 5 and above.
Dynamic Contrast: I don't like any "dynamic" controls like this. I leave mine set to 0. Often using a slightly higher Gamma will give similar results without the chance of causing artifacts. Whether it is a Dynamic Iris, or a Dynamic Contrast, they use an area based algorithm that can, and will in some cases, be fooled into doing the wrong thing. First rule would be to not use both a Dynamic Iris and Dynamic Contrast, as they are trying to do basically the same thing and they can interfere with each other.
If you want one of these, first try the Dynamic Iris if your projector has one. I suggest you try it at a low setting. If not, or you have a TV, and you want to test Dynamic Contrast try setting it to 1 or 2. If you have a Radiance that includes Darbee DVP(TM), I suggest that the Dynamic Contrast be set at 0 and use the Darbee feature - which is similar to a "special twist on local area dynamic contrast" control, and works much better than a large-area based Dynamic Iris, or Dynamic Contrast.