Well I made a change and went for the Fisheye FIX LED1000DX instead. From what I've read (and after some more extended discussions with the vendor), it sounds like the 1000DX puts out significantly more light than the SOLA600, for not much more cost. The SOLA does have the red option, looks slightly more compact, and is a little more sleek looking. But the Fisheye is still pretty small, and should travel well. The SOLA is sealed so no risk of flooding there, but overall, I think the Fisheye is better for my needs. I suppose I can get an extra battery for the the 100DX - not sure yet if I will or not.
As for my plans/expectations, I'll be mounting it on a Canon HF200 camcorder in a Canon WP-V1 case. I'm new to UW video and my expectations are modest. I know I'm not going to get cinema quality, but I'd like to give the camera a chance to do about as well as it can given my other constraints.....since all my diving is done after a series of long flights to some tropical destination, being compact is very important to me. I'm purposely trying to minimize bulk and complexity (and to keep the costs form escalating too much). I expect (and hope) for good viz, and will be mostly shooting in daylight. I have the standard (built-in) lens plus an Ikelite W20 wide angle. Not terribly fancy but I'm hoping to produce something "good enough". I'll be shooting....whatever there is to see in Raja Ampat, to the best of my (limited) ability and conditions permitting. We'll see about those variables.