I think this is my best HDR image I have done, I don't know why it came out so clean. I think there is something to getting the darkest and lightest exposures dead on so Photomatix doesn't have to push any of the exposures.
Very little editing after tone mapping.
I agree that the exposure spectrum should be done in camera before photo matrix. This came out very nice, and I usually try HDR's in low light, or cloudy settings, and never tried with the sun.