Just for fun, thought I would test to see how much difference a basic ND filter and CPL could do to improve on the HX9. The ND will bring the shutter speed down on bright days to reduce the strobe like effect. The CPL, of course will improve overall image when dealing with Polarized light. This is a basic Cokin P system filter holder (this one can hold up to 3 filters). There is a slot for a CPL that can be rotated. I've also stacked two Cokin P hoods to help prevent lens flares on the large filters. Normally the filter holder is attached to the filter ring of a lens. There's no filter ring so a friction arm keeps things in place while still being adjustable in case I need to zoom. Yes this can all be used on pretty much any other camera. If it all works well, i'll build a stage of sorts to be able to mount it on a tripod.
[Update] Here's a video sample with and without the ND Filter. The focus was thrown off from pulling the ND in and out, but if you leave it in the Auto Focus is fine. I could try stacking ND filters to cut down the shutter speed even more. Notice how choppy the water looks without the ND filter and how it flows with the ND filter on. Overall, the ND filter makes a pretty big difference.