What are the specs of your pc? That would make it easier to gauge your real needs. I always go with Seasonic, they are the best psu manufacturer. http://www.newegg.com/Product/Product.aspx?Item=N82E168... That one is ten bucks more but well worth it. A psu is not something you should skimp on as far as quality goes.
This is cheaper before the rebates/promo codes on the Neo Eco 620C, but more expensive after.
NZXT Hale82 650W ($60 @ Newegg) http://pcpartpicker.com/part/nzxt-power-supply-hale8265...
Based on the Seasonic M12II Bronze 650W (SS-650AM). It is better because it is modular, more efficient and has independent voltage regulation. However it will be noisier, due to the idle speed of it's fan being 1000RPM vs ~500RPM on the Neo Eco/M12II/S12II Bronze units.
The Fractal Design Core 1000 will accept ATX PSUs up to 180mm deep.