The 560 se is a very watered down card, many more of its resources are disabled and it is underclocked. It's just not a good buy as a single card. It is better than the 550 ti by a lot.
However, a well built 560 se could be used perfectly in an sli setup, at $260 that would be more powerful than a gtx 580 which would be an excellent deal.
For a single card at the $130 price point I recommend the 7770 and at the $170 price point the following gtx 560:http://www.newegg.com/Product/Product.aspx?Item=N82E16814125390