I've heard that Neat Video is extremely good at removing ISO noise. I find that I achieve the "cleanest" video by 1/48" @ 23.776fps, make a decision on the f stop I want, 99% of the time I use ISO 100. If the image is too bright I use an ND filter or reduce the amount of light. If it's too dark, I add more light (to the limit of my lights). I must try Neat Video!