OCZ's are also good PSU's. I don't know about their noise levels though.
Don't stress too much, and start worrying or anything. If you buy an OCZ, Fortron, Seasonic, or whatever. They're all good PSU's, and your chances of having a problem with any of them will be about the same. Translation: You probably won't have a problem with any of them. The modstream is cool because it has its own cable management, if that is something that interests you. I've owned and build lots of computers with Fortron PSU's, and can vouch for them personally. I also have current machines that are running a Vantec Stealth (very quiet) and an Antec from back in the day. I've also never had any problems with those two brands. The Vantec Stealth is no longer being made though, you may be able to find it, but it would probably be used.
Like I said, you can't go wrong with any of them. I love how so many people tout the PC Power and Cooling PSU's. AS they should, they are awesome and well known for quality. But the fact is, Forton is the exact same thing. And for an unbelievable price. I think American's (more so then just people in general) pay too much attention to price. "You get what you pay for" is a very good rule to follow, but its not always true. And so people are always willing to pay more because they think they're getting something special. Alienware is another prime example, or the Escalade's premium over the GMC Yukon.
Is Seasonic an Awesome PSU? Yes, it rocks it, but is it better then the lower priced Fortron? No, its not. By paying more, in this case, your not getting more.