I was looking for a ~400W PS myself a couple of weeks ago. I was pretty certain I would end up with an Antec TruePower 430W, since they come so highly recommended (I have one in another computer and they are, indeed, great). However, after digging and doing some research for a bit I ended up settling for a Thermaltake PurePower 420. It's ratings are very much similar to the Antec, and it comes with variable speed fans (which I have not yet heard spin above the minimum). I have been thoroughly satisfied with the unit: The rails are very consistent, the supply is quiet and there are plenty of connectors to go around.
The most important reason I chose it, however, is its price: it is significantly cheaper than the Antec.
My recommendation to you is either an Antec TruePower 430 or a ThermalTake PurePower 420 🙂