Phil, you seem to sufer from a confidence issue, which we can all appreciate, but it would be nice if you could take some time to sort out the areas in which you have questions, and trying to combine it all in one post.
(we're all here to help, no matter what way you go about it)
The Epox board (along with the Asus A7N8X) are so far, the best overclockers, but like all boards, each has its issues.
The NForce2 chipset is available in now three versions: A2, A3 and the latest: A1, aka C1.
The Asus is now available in revisions 1.04, 1.06 and 2.0. The latest has the C1 stepping NForce2 chipset. The latest Epox also uses the C1, in its latest rev, but I'm not clear if they are marked or identified in any way, so Epox just annouced the 8RDA3+, which officially supports the Barton core. That's the Barton core with a 200 FSB.
I believe that the Epox has been reported as being overclocked ever so slightly higher than the Asus A7N8X, on average. I know nothing about the ABIT board. The A2 and A3 chipsets have a reported average overclock in the range of (max) 185 FSB (but some people report being able to reach 200). The newest revisions can do 200 FSB, without any issues.
The Asus has limited voltage settings, but they are all within a very safe range, for overclocking. The Epox can overvolt a bit higher, but the latest ones will require a mod for one of the voltages, because the option has been summarily removed. Both boards have very flexible FSB settings.
The Epox and Asus boards come with radically different features. The Asus has the nice built-in sound, 2 net ports, etc... You really have to consider your usage here.
I think your CPU will do well. I'll probably pick one up too.