So right now I have an I3 550 that I am making into a mineral oil pc. I obviously want to change this and overclock it. I am deciding between an I5 650 and an I7 870.Any suggestions on what I should use? I want the most performance i can get without making a dent in my wallet (so under 80 bucks on ebay) And i again i will be overclocking in mineral oil. Thanks