I've seen thirstier rigs run off a True power 330. but it's obvious the supply is working hard. Anytime the air blows hot from the exhaust I consider it time to upgrade the supply. While you could get by with a True Power 330, I would recommend the 380 if you have your heart set on a True power.
Myself I favor the FSP/Sparkle series of power supplies. The 350W model will indeed run your rig effortlessly, and is priced much more reasonably. Some people just feel they have to spend more money than the sparkle costs to be getting anything, but it will drive your load easily.