<< I hate antec, if your PSU dies don't expect to get any support or even a replacement from them at all. If you can avoid it, take my advice and go with something else.
That being said $40 extra isn't worth it in my eyes, I got a pretty good 400w psu for $35 off hot deals awhile ago. But if you plan on using the case for another computer in the future, or are using a tbird over 1ghz or P4 with something like a Geforce (any model, though the original gf was really power hungry) go for it, the extra 100w will be nice to have, especially if you start adding extra HDs, burners, pci devices, upgrade your CPU to something that uses more power, etc... >>
You sound like yet another Antec victim. Take his advice, avoid Antec power supplies.