The review you linked to isn't very accurate in one regard, and that's overclocking.
Aceshardware was able to overclock the ASUS A7N266-E (nForce 420-D) to 165MHz FSB without any problems. The ASUS A7N266-C (nForce 415-D) is already selling in the UK, and should be released in the U.S. in a matter of days/weeks. A7N266-C should overclock to ~165MHz FSB just like the A7N266-E unless ASUS did something very different to the board, which I doubt.
In the UK, the A7N266-C is ~105 pounds (~$150 U.S.). By the time this board makes its way to the U.S., it should be slightly lower than that price, and will go even lower in a matter of weeks after its release here.
Personally, I think ASUS hasn't given their A7N266-C enough features (and the price is too high IMO). Abit's NV7-133R (415-D) motherboard should be released soon. It has RAID ATA 133, USB 2.0, 3 DIMM slots, nForce sound, and friendly overclocking options. This board is supposed to start out at ~ $130 U.S. This board will be a big hit among enthusiasts here if it's just $130, since it offers almost everything an enthusiast could possibly want.
SiS, VIA, and ALi aren't introducing anything new in the coming months, just as nVidia isn't. There's nothing new to introduce except support for features like ATA 133, USB 2.0, etc. DDR333 won't really matter that much either, since the Athlon can't take advantage of it. From my own experience and from talking to other people about nForce boards (like MSI K7N420 and ASUS A7N266/E), nForce is stable and very fast. Once prices come down, I'm sure a lot of peeps here will be jumping on nForce (415-D).