Here's what I have, though it's far from the only option out there.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044
Personally, I'd say it's worth spending a little extra on an 80+ PSU. It's largely a marketing thing, but it does guarantee a certain level of efficiency out of your PSU at fairly common load levels of 20, 50, and 100%. Namely that the PSU is at least 80% efficient at those loads, or that 80% of the power the PSU takes in goes to actually powering your computer, not wasted in the form of heat.
While it doesn't guarantee that the PSU is 80% efficient at any other levels, it would be pretty difficult to engineer a PSU that is at least that efficient at some levels and not others. At least based on my rather limited EE knowledge. So, it's not a guarantee, but it does strongly suggest that your PSU will be more efficient overall, and that can have a nice added bonus on your utility bill.
Also, when looking for a PSU, don't just go overboard and get like a 1.2KW (1200W) PSU, because then you're still drawing in huge amounts of power from the power grid that is really just going to be wasted. Unless you're planning on running two of these cards, your current PSU may well be fine. If you really want to get a new PSU too, it's probably worth a little extra to get an 80+ model, but I wouldn't really go above about 650W, or you're just going to end up wasting a lot of energy that you then have to pay for in the form of utilities every month.