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Any of these as long as your MOBO supports them -> http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007671%20600005864&IsNodeId=1&bop=And&Order=PRICED&PageSize=20
For a full list of supported LGA 1156 CPU see your MOBO's supported processors. Example of ASUS P7P55D http://www.asus.com/Motherboards/Intel_Socket_1156/P7P55D/#CPUS
; your MOBO support may vary.
Q - What MOBO do you have now?