You're burning daylight, Brian. I shoot the same kind of thing you've described - travel, occasional family events, mini-documentaries. I get some paid work too and one of the jobs I'm finishing now involved turning 40 year old film footage and a ton of Hi8 analogue tape from the 90's into a finished piece for a family who wanted to preserve the images for the kids and their kids. What I learned was that HOW you shoot matters far more than what you shoot with. The Hi8 stuff was shot by a guy who took the camera out three times a year. It jiggles, goes out of focus, loses subjects in the gloom of a dim family room, tracks kids in the yard for what seems like days at a time. The important stuff involves shooting from a stable platform, using available light well (reflectors, time-of-day, lights turned on), replacing the on-camera mic as soon as you can afford to (even the Azden SGM-X shotgun at $100US will improve your audio amazingly)and thinking about the edit when you shoot. Never shoot casually unless you want your work to be watched casually, if at all. For example, if you're focused on a mountain lake and after ten seconds decide to pan left, reset when you're done and shoot again but this time pan right. Now you have three possibilities in editing which gives you every chance to match one of the shots (still/pan left/pan right) with whatever comes next. It's about feeding the eye what it expects. If you watch good work critically you'll notice that scene changes don't drag your eyes all over the screen. If I pull your eyes to the left in a clip, the next clip will have its action on the left, because that's where you're looking.
When I recently watched a DVD of my travel stuff I noticed that the main difference between my piece on Portugal, shot in 2001 with my D-8, and more recent stuff from British Columbia, shot on my VX2000 was technique,not image quality. Yes there is a difference in image quality but the average viewer wouldn't think so. But the average viewer is so conditioned to movies and tv that he or she will notice bad production values. Buy one of the cams on your list and start shooting.
David Hurdon