I would say that you should shop for the antec brand of psu's ranging in the 400-500 wattage range. They are of good quality and shouldn't fail you. Aside from your 9200se and your sound card, you have energy hogging parts that will need sufficient power. Or, if you get any of the mediocre brands of psu's, at least get a 480-500w's. Antec's tend to be more pricey when they get up to that range so it's up to you on what you want to spend. I am using a MGE 500w psu, and if I had the money, I would probably switch over to antec, or maybe even enermax's brand of premium psu's.
With your system, an antec "true430" should be more than enough...and with any other midrange brand, at least 480+...