Of the two, i'd prefer the Antec, but not for $30 more. I've used that model Enermax before, and I'm running an XP1700+ on a 300w Antec now, and both worked fine. If you have a relatively normal setup (not running dozens of drives, etc.), the 330w Enermax will be more than sufficient. No dual fans on the Antec (well, the 300w model anyway, don't know about the 400), but that's not a biggie, since i yanked out the loud fan inside and replaced it with a L1A Panaflo (a very easy mod, BTW).
IMHO, unless you have stability problems or want to build a "super system" with dozens of drives and heavily overclocked , go with the PS which comes standard in your case (unless it's low wattage like 250w or less, or some POS like a Deer, in which case chuck it and buy a quality brand). That system works for me, but as others have said, YMMV.