Yeah, as HardWarrior said, depends on your near future upgrade plans. If it only goes as far as graphics card, hard drives and other such units, then I'd say it'll do the job fine.
Anything too drastic, though, and you might want to consider a bigger PSU. Personally, I'm going to be running a 500watt with the system detailed in my signature, and the PSU should cover any small upgrades.
I intend to pick up an Akasa 650watt eventually, though.
Edit: I just did the same PSU calculator, and it said I'd need 355. So.. I'd say that your proposed PSU should cover you for what you want, and small upgades. Anything big on the upgrade front, and I'd look at a bigger PSU if I were you.