6870 vs GTX 560 OC VS GTX 560TI

argueta789

Distinguished
Oct 13, 2009
154
0
18,680
i3 2100
8 gb 1333 memory
700 w OC-Z ModXStream PSU
HIS HD 6770
21" Monitor
Looking to play battlefield 3 and similar demanding games as battlefield
Want to upgrade my 6770

Gigabyte GTX 560 OC $ 179 after rebate : http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=858869&CatId=3669

Gigabyte GTX 560TI $ 189 after rebate : http://www.newegg.com/Product/Product.aspx?Item=N82E16814125401

HIS HD 6870 ICE $ 150 AFTER rebate + dirt : http://www.newegg.com/Product/Product.aspx?Item=N82E16814161393

which one will give me a better increase in performance ?
and is it worth upgrading?