Huh. While I've encountered players who never moved 4th, that group doesn't seem very well represented on this discussion board. The vibe I'm getting (from an admittedly limited sample) is that a lot of people here haven't switched to 6th but have just stuck with 5th, and that, whatever the virtues of 6th edition, it doesn't really seem to have caught on. Would you folks say that's true of the bulk of the Hero community? Just wondering.... (The people I've dealt with have only really played the 2nd-4th editions.)
As I mentioned, I've purchased all the new stuff -- and swiped source material from all over the place -- but the version of the system I work from is 4th, just because it works for me and my players. (I couldn't agree more, Doc Democracy.) Sure, there are tweaks (like the block mechanic you mentioned, Ninja-Bear), but overall, that version seems the best fit. (Incidentally, one thing I've imported is the Striking Appearance mechanic, but I use it as an effect of Comeliness, which I have costing 1 CP per point. I have a simple Comeliness table similar to the Strength table where every 5 points of COM above 10 have +1d6/+1 effect, with every 3 points adding half a d6, as with Strength and damage. Simple, and the only thing that changes on the character sheet is the doubling of the cost of Comeliness.)
Anyway, thanks for the responses, all!